Hmph, Not sure, cause I never use the sharpen tool. I have an edited version that Im going to post; I got some CNC from some other people. So here it is
Hey have you heard of a add on filter for gimp made by some dude named lazlo... it makes a blurry image look like HD Ill try and post a link maybe you could put it to good use!
I know I'm not a designer yet.. but in my opinion the one from your first post is the best. and maybe make it just a touch darker so that the white isn't so bright... (unless that is what you were trying to do.)
The second two were heavily focused on filly some empty spots, lighting, and depth. I like the newest one the most; not sure tho lol. I might use it for a SOTW; depending.
I really like the colors. They are vibrant and great. I do see where you are coming forum though, the red doesnt mesh well on the face, but otherwiise the colors are almost stunning!