From what I gather, your modeling is alright. What needs work is texturing, and lightning. What you should do is find a rendering software which suits your 3D program. I'm guessing you either use 3dsmax or Maya. For both of these programs you can find rendering plug-ins. For example Vray or Mentalray to name two of the…
For the rendering issue, as far as it's game art, you can't render it in Mental or Vray, you have to check CE 3/UDK/Unity. Also on 3dtotal are lot of good maybe not tutorials, but tip's for the lightning and texutring process. This is very good site. +1 ^^
The textures need a lot of work on this. I would point you to texturing tutorials at: https://www.3dmotive.com/f101201 and http://eat3d.com/udk_modular to start. Actually check out all the content related to texturing on those sites and the http://wiki.polycount.com/TexturingTutorials for texturing tips. The materials all…