You really need to work on your depth especially in the first one. The second one is the best but like Crazy said it looks half finished. A lot more could be done to it. The last one looks awkward and the render is over-sharpened making the edges look choppy. For text I suggest you read a tutorial about the "rule of thirds". You'll improve in time bro don't be disheartened :y:
Alright thanks, if you could give me some links that'd be nice.