The focus of the various elements is not consistent, and the floor is at a different perspective angle to the man standing on it. This just looks hurried and thrown together.

Light source on paper is from top left, on the man from upper right.

While the concept is very funny, for a higher score you may want to run a very soft blur brush over the edges of the man, his will make him blend better (he's very roughed edge and the top of his head has the white edging (IMHO)

Select the FLOOR LAYER and use PERSPECTIVE on it, and you will find that it will blend better as well.. (took me some time to learn how to do that and I still have trouble) but you have enough pattern in the floor so it should be quite easy...

Gray Gaussian disks placed beneath his feet (at the floor perspective) will help ground him as well.. Good luck author (The humorous concept of this piece is very adorable)

EDIT: 100% Improvement author.. good luck

thanks everybody for the tips