on the updated one. it is good. but erase the stuff off of her face. its the focal. its supposed to pop out. if you have brushes on the focal, it defeats the purpose of the focal. maybe a different color of megan fox instead of just one color
The first version is meh and as everyone else said her head looks like it's free floating.
Updated version is better but defineitly erase what's on her face, it tends to draw eyes away from the focal thus ruining the signature.
Try doing more with your signatures it looks like you just made a BG with some brushes and did a few things to the render.
Overall it's not bad 7/10