Like the third one a lot. Nice, warm, colors. The second one just doesnt say anything to me. The first one could be good with a little touching up. It is much too dark as it is. I see where your coming from though.
1 big thing I want to let you know to watch out for is the background. you could have the best shot every but if there are trash cans back there and shoes and crap it will take away from the picture almost completely. Watch out for that. GL
TJ
Hardly did anything to it besides increasing exposure. Hope thats ok. But i noticed that as i increased the exposure the shot became more grainy around the keys.
#1 - Clearly underexposed.
#2 - Color balance is way off - unless you live in a house with greenish walls . I'd use Picasa's (free) neutral color picker to adjust it.
#3 - Nice! But I'd still try to adjust the color balance a bit.
Hope this helps. Keep shooting and asking and you'll get better shots in no time.