The second one is great, the lighting is pretty much perfect and it compliments the scattering on the arm. Very nice flow overall and the composition and colors are wonderful.
First one is Empty, thats all I can say for it really. work with the Negative spacing, it works in some sigs but not for this one.
Third one is decent. It's really over sharpened. after you add the sharpening effect, go to edit and there should be an option called, fade sharpen. It really helps to cut the sharpening back to somewhere where it looks really decent.
I hope all this helps.