As said before, its a great concept and great modelling, well done on being really successful with that side

I think the textures (at present) is letting the final model down. Have a look for example game model textures and see how they make use of high contrast and high colour. Paint it and then experiment with upping the contrast. Then paint over it some more and maybe up the contrast again. Just a little bit more work on that should help bring the model out more.

Good luck though and thanks for showing us how to model a great concept