You are good in modelling. The faces are quite detailled an realistic. I would suggest you to try out some other render engines. I know, it takes a lot of time to learn to use them, but its worth it. I use vray for example.
I've been using mental ray for my final renders. Most of the renders i have here are just quick wip ones to see the forms.
some people dont understand the work that goes into 3D meshes, this is nice work mate.
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