Since you colored the text on the box, you should color the text at the bottom as well.
The shading is a bit too heavy, the bottom of the 'J' is almost completely obscured, and it does not correspond well with magicsteve's feet.
I think you should also move the words closer together.

Is a very cool picture

The pizza is a weird color, but still a decent colorization job.

I have edited my entry. Now you can view it in hi-res.

It looked better without the skull, which adds nothing to the image.
The additional nipples also look like overkill.
You also have way too much dead space on the sides.
It was a good image as it was. Now it's trying too hard...

Ok maybe I forced a bit. I'll remove it. Thanks MossyB. Anyway, I'm a beginner after all. thanks again.

My entry was removed temporarily because I forgot to upload my SBS... lol. Now I'm back.
Cheers..!!

The shadows on magicsteve do not correspond with the drop shadow beneath him - one is lit from the side, and one from above...If you also look at the other people in the background, you do not see such heavy shadows on one side of them, general ambient lighting is stronger.

You can try using the Dodge tool or Image>Adjustments>Selective Color>Blacks to try to bring it more into line with the rest of the image.

one way to do minimal change is to convert the pizza-guy to a signage instead, with white edges all-round (a cut-out look)