The colouring seems a little flat, I'd suggest adding a brightness & contrast layer, or a black to white gradient map set on luminosity to make them a little more vibrant. I prefer the colouring in version two, it looks more natural to me.
The background itself looks quite nice, but it's hard to tell because it seems like you've overused the gaussian blur -> lighten effect

It's making it hard to see any details. I think you could do with sharpening his face slightly as well, it's all a bit too blurred.
Um, there's a faint line down the left side (his right) of his face, which looks really weird and is irritating me. Not sure how you managed to do that tbh.
Text is quite hard for me to read, and very small. Personally, I would have tried adding text in the middle of the signature in a font like Times New Roman at a medium size, then blurred/erased it until it blended into the background.
It's not a bad signature on the whole, but it could be improved. Hopefully the c/c has been helpful.

Edit: Wow, I didn't realise I wrote that much O_____o