There good and all have a lot of potential.
Few tips, if you don't mind.
When using the stroke (on the background image) I'd suggest that you do it on the inside of the image rather than the outside.
Also in my experience stick away from bevel and emboss, it either is too strong or too weak, there's no where in the middle.
You should also download some free brushes and gradients.
Otherwise good work, I can see your getting a lot better from practise as your newer signatures are better than the older ones.
Hope to see more