Since you asked I will tell you some things I see. This isn't a complete list but some things to help you improve it.
View attachment 10976
In the red, the drop shadow doesn't belong here. On the ground maybe but you wouldn't see it in this photo.
In the blue, you may try using the pen tool to get a better mask. Painting on a mask is great but not always the best choice.
Eminem is blurrier than the rest of the photo and also brighter you'll need to fix this to make a better fit.
Hope this comes across as constructive....seems like my c&c isn't always perceived that way.
This is what I see.....others may see some other things too.