When I started using FPSC, the average quality of 3D artwork was much lower. Now, due to advances in commercial games, and FPSC, this standard has rissen considerably and can leave first time modellers feeling outdone. Be proud in your work! Take criticism well, but only if it is criticism. The models are great, but you need to work on your texturing capabilities, which is something I've always struggled with. Try watching Avenging Eagles texturing tutorial, and then possibly retexture your models, or even make new
better ones.
Once you are comfortable with your abilities, look into shader effects. Then you know your games will look good

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JRH