If thats smuding, thats incredible. Overall i think the render blends nicely but is a bit overdone. The background adds nicely to it, the relaism could be better, if you tone down some of the smudging (Thats what i believe it is). The lighting is really nicely done, could be a bit toned down a bit, is a bit harsh on the eyes. The contrast int he piece tho is amazing, i would just try gaus blurring some background parts, such as the hills, and adding some text just to make this sig.