2 is good, but the rest have some pretty severe color, depth, and blending issues. You really need to work on your lighting and it would help a lot on these problems.
Monotone makes for a flat and uninteresting sig. Shadows, depth, and correct lighting make a sig better.
Oh, sarcasm is hard to convey over the internet. I have given people crit that are actually like that.
Your blending is getting a lot better, although your current sig I'm not sure about. You definitely could work on colours, lighting and depth. Good stuff and a nice improvement from the last time.
A good way to combat monotone is to soft-brush alternative lighting in a complimentary color and highlight your stock in accordance to this faint secondary source of light (sort of like a back-lighting), or just put in a gradient-overlay on soft light or something to automatically add in some color variation. This first suggestion would be very beneficial to your rose signature since you have no dominant light source Depth is something you'll have to spend a little more time understanding, but the easiest way in some of these signatures is to just bust out the blur tool, or even Gaussian blur
The top of his head on yoru current sig looks strange, Other then that your obviously a mile better then me
Quote nce as far as I can tell, but more use of multiple colors such as in 2 and the lasyt one would be nice.