OK, I have been working on this for a while now and need your input. I know this isn't the best sig, so I'm not getting my hopes up of any WOW's or AWESOME! lol. Now where you come into play is where should I put my light source? Do you like it where it is or should I move it to the right side and make it look like he's drilling and found light through a hole or something...? Or any other place?
I dont really see a defined lightsource currently. The tag is not going to flow well considering the large size of the render, and the difficulty in telling what exactly is going on. The lightsource you do have set up in the top left(?) does not correspond with the rest of your tag. If it is that bright up there then surely the bottom right and rest are not going to be as bright has they are now. My two cents.