Jesus it hasn't just been a while making a signature, it's been a while since you've actively posted on Sythe! Where did you go? (Yes, I was somewhat of a lurker/leecher/newfag when you frequented here)
Mmkay, main thing - avoid putting borders of any type at all on your signatures . Adding extra and unneeded horizontal or vertical lines, however thick, detracts from the flow and leads the eye in all sorts of wrong directions.
With the top signature, you should stick to one main colour scheme - the sandy browns and the cool blues/greens don't mix very well - I'd advise you to possibly place a cooling filter of sorts on top of the browns and bring it all to relatively the same tonal/colour range.
You did well defining the focal, but the corners should be a little darker.
You should try and create a definite light source(s), and then adjust the lighting across the rest of the signature to realistically fit with the stocks/renders used - darkening parts that would usually be shadowed in real life, and highlighting sections that would fall directly in to the lights path.
