It is .PNG. Also, I had the same color BG because I was using the color to make sure it looked smooth. Black nor White are good for that, so I use the GameRenders BG color. Forgot to take that off!
this sucks, its a good render, but you cant use it because you didnt actually leave it transparent...for some reason you colored it the same as the gr background...if its transparent i could use it...but its not...soooo im not going to be able to use it
no, you cant remove the background layer, it would have to be psd when its png it merges all the layers
just to tell you, you need permission to render this, because its not a game render its a painting done by http://www.goodbrush.com/ and if you read the rules you arent allowed to render any artwork without permission from the author