Floating head syndrome. Try to include part of the body in your sigs. Add depth and color, try to stay away from B&W sigs if at all possible. Borders should be one color, not a displacement or whatever it is you did. Yeah, that's about it, keep it up.
That is not much better. The coloring is monotoned at the moment, i think anybody would prefer black and white over a monotoned tag. The lighting is forced, try not to brush for lighting, try to make it look more natrual instead of of looking like you had to brush for it. The composition is bad, FHS is really bad, next time, as said, try to incooperate more of the focal's body into your pieces. I hope this has helped you.
FHS ; Floating Head Syndrom: You are not supposed to only make a tag with your focal's head, it kill's 85 % of tag's, and unless you know how to use it correctly, it is a killer. Compo ; Composition: The basic arrangement in a set piece of art.
I would like to see a variety in the color all hope is not lost in this sig! Bring back the natural tone of the skin (if possible) and add the shoulders in. Possibly make the person a pop out of the border, to verify the shoulders are there.