Definitely need to darken this up a bit too get some contrast, everything just looks a little too bright right now. I do think the lighting is very well done, there's just no darks to contrast it. Also, I love the render, there's a lot of good passion going on with it, but what's up with the cutoff bottom? Sometimes cutting a render off can work but I think style wise it doesn't fit this sig and just stands out as odd.