Viewer Settings Tab at the bottom right has an option for increasing the intensity of the AO map. Might try cranking that up a bit ( I typically like it with darker AO). Other than that, ad in some edge wear. Also consider chaning the color of the under shirt. It doesn't stick out that much. Either lighter or darker, or a different color like maybe dark green.
Coming back from Las Vegas, a couple of the hotels had interesting stone work going on. Something to the effect of what seemed to be like marble being spliced inbetween plates of glass. That might be an interesting material idea to pursue if you feel up to it.
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Other than that, ad in some edge wear. Also consider chaning the color of the under shirt. It doesn't stick out that much. Either lighter or darker, or a different color like maybe dark green.
I'm thinking something like this:
https://farm4.staticflickr.com/3202/3292020330_06a00fe4a5_z.jpg?zz=1
added edge wear and small detail stuff trying to make it looks wet as if the rain start to fall on him