Which one take real pictures?

Canon 550d, Nikon D3100, Pentax K-r.
Which?

"Real pictures?" What does that mean? Every camera takes real pictures. If you have a deeper question best you write it out - this is way too vague.

Real pictures? You mean that it looks realistic?

They all do, but if you don't know how to control the camera, shots will be bad. Pentax K-r is the best price/performance model, but if you're looking for the most famous one, then D3100 will be the best.

Here's a DSLR Buying Guide - http://www.the-dslr-photographer.com/2009/11/which-dslr-to-buy/

Real pictures? Lol.

Answer: You (even that needs questioning)