Those probably aren't premade pictures, you shouldn't underestimate other people's work. They are most likely photomanipulations, or he just placed a render ontop of a stock. Either way they look pretty sick, the lighting is spectacular and they have a bunch of depth. Just work on the messiness.
1st:Im not some kind of noob to do that.
2nd:does the 2,3 look just pics with overlay? on 1,4 i worked only with the original stock mostly but there are effects.. and that was exacly my point in those sigs..to have effects based on the stock.
3rd:you could ask to see the original picture and dont make me noob by saying the above.
@mf29: By calling them sick.. thats a good thing right?