1-Bad cutting (Try to practice more in this, or go to a render site to get render psds that are ready to be used).
2-Bkg doesnt suit the theme
3-The signature looks in a mess coz of un-organized placement of the text and psd. (its too crowded signature, you just threw anything that is related to MVP in the sigature that made it look messed up).
Try modify those things and it will look much better.