I Really need a photographer's point of view on these pictures?

I'm a 16 year old amateur photographer and I was just wondering, if a real photographer, would look through my set and tell me, what the best one is and what I can do to improve them.

I guess some of them could have been better with a smaller aperture and some might be a bit overexposed.

Btw, you don't have to comment each picture.

Here's the link:

Btw, I use a Nikon D3100 with a AF-S DX Zoom-NIKKOR 18-55mm f/3.5 (not the best lens)

Nikon D3100 and Photoshop?

If shooting in Raw (NEF) on the D3100 the file that is made is not compatible with Photoshop (CS4-Mac). Does anyone know a way I can get around this?

Best sports lens for D5100? 300mm Equestrian Photography?

What's the best lens for sports photography (Equestrian photography) for the Nikon D5100? I'm thinking of getting one… Needs to (obviously) have a fast, quiet, AF and no more than $400. I'm used to usong a 300mm on my Sony alpha so I think a 300 should work BUT if 200 is really recommended, I'll live. Thanks!

Added (1). Oh and also it needs to be RAZOR sharp. I want DETAIL.

Camera or camcorder with 1080p video and specially with GOOD auto focus?

I need a cam that shoots 1080p with good accurate auto focus, without using DSLR's e.g: Nikon D7000, Canon 600D 'T3i Help me

Added (1). I mean not DSLR's

Nikon D3000 black photos?

I was taking photos in the Smithsonian and my photos began turning black. I cans till view previous photos but new ones taken are pitch black. Is this a common Nikon D3000 error or is there something i can do to fix it?

Added (1). It's not the exposure, i've used the camera on all settings. I own a D90 and a cannon EOS rebel and a photographer for a PR agency, i know a thing or two about using a camera, just not fixing them.

Will AF Zoom-Nikkor 80-200mm f/2.8D ED auto focus with a Nikon D70?

Will AF Zoom-Nikkor 80-200mm f/2.8D ED auto focus with a Nikon D70?

Canon 1100D, Nikon D3100, Pentax K-r?

Which of the three would be the best? Going to film some stuff, make pictures, normal stuff. Also, what lens would you recommend? I'm thinking 18-135mm would be nice.

Canon - I like the looks, but the grip is plastic…
Nikon - I read that lenses and stuff are expensive and only Nikon lens supported.
Pentax - A camera shop told me that it's ahead of other cameras. But I'm not so into the looks.

Also, does it matter if Canon only has 6400 ISO? As I read that 12800+ is useless. I can't decide.

Photography equipment to use?

I'm a photography student and I shoot anything from weddings to outdoor portraits. I have a few questions about what equipment I should start to invest in. I currently have a Nikon D80, and an off camera flash.

Should I invest in a set of strobes, umbrellas, and light stands? Flashbracket? Or off camera flashes with slaves?

Any advice would be appreciated, I get confused when it comes to slaves, cords, flashes etc. So please be detailed.

How to get my sensor to stay up on my nikon d40?

Okay so my D40 doesn't have a self cleaning sensor. It also doesn't have a setting where I can lock the mirror up. There's an obvious flaw to my sensor (I think it's dust) It's a spot that is ruining all of my pictures. I think I could get it off if I could just figure out how to make the sensor stay up in front of the shutter long enough to clean it. I know there has to be a way to do this I just can't find ANYTHING online about it. I know all the other stuff, like charge your camera, plug it in, make sure you set it to lock mode… Blah blah blah but I can't figure out how to make it so I can actually get to the sensor when I'm not taking a photo? I hope I'm making enough sense here. Let me know if you need additional explanation. Thanks!

Added (1). Okay, I know there's a mirror that goes up, my issue is beyond the mirror. It's behind the mirror where the sensor is. When I take a photo the mirror goes up (of course) and then there's a shutter, in front of the shutter is what I believe to be the sensor, it goes up for the amount of time that it takes to take a picture then returns to the inside of the camera. I don't know what setting to set it to or what to push or pull to make the sensor not return back into the camera so I can clean it.
I would take it to a professional but I need my camera today for a family portrait that I'm taking. Plus I don't like paying someone to do something I will eventually have to learn to do regardless.
Thanks everyone for the responses… I will have to just keep trying to figure this out I guess.

Added (2). I finally figured it out! Okay there's a setting on my camera that allows for a simpler menu, I had to set that back to normal menu. I bought this camera used. Then I set the mirror to lock. Everyone is going to be mortified but took a q tip and gently cleaned off this rather stubborn dot of dust or something. But it all worked out just fine, I think the sensor is actually a little more durable then believed to be. In my situation it honestly could only get better, this dust or dot of dirt was stubborn and large on my photos. All is good now and thank you to fhotoace for telling to go to the manual and look and providing the link and page. (I don't own a manual). Thanks everyone, glad it's fixed and really clean now!

Does the Nikon D7000 store pictures without a memory card in place?

So silly, but i put the memory card into my computer to look at older photos then a friend of mine was using it to take fairly important photos… It was working normally you could take photos and they would be displayed for a few seconds after as usual, but now i can't see them… Would they be saved or gone?