i for one love bats and i can tell you this they are many colours OKAY! black, brown, gray, tan, bald, and redish and there are probaly many other colours
but for the skin gray was the best choice, simply because its more evil and black doesn't shade well
a thirsty vampiric bat of the night, in that case maybe fix it up. Right now i would say its half done so 3/5 but when its done it will be an awesome skin and usefull.
Made a remake of my bat skin, because people insisted that bats are grey. So I changed that, and a lot of other details, as the ears, eyes and bone position.