1st add to the bg, all it is is c4d :\ 5/10 2nd nice, maybe add one more thing to the bg to enchance it more? 7.5/10 3rd-i just flat out dont like that, sorry 6/10
if you think all i did was just slap on some C4D, you sir, are gravely mistaken. 8/10 - nice, not digging the smudging on his face 7.8/10 - not digging the lighting taking up the entire lower half
8/10 - not diggin the pixelated lines, still a great sig 8/10 - its pretty good for a b/w sig, could maybe use blend of color from the stock....
4/10 looks like it has a very bad quality? and those pictures kills it 5/10 over contrasted and bad blending 4/10 please remove the stroke around those boxes... sorry but I don't seem to kind this morning
6/10 it looks nice but the colours of the BG kinda ruiens it try picking one that fits more to the render