You can grab Harley Quinn, Catwoman, and Poison Ivy for the low, low price of $30 each.
Butch Mapa is a professional illustrator and graphic artist in the Philippines. You check out more of his work on his official site and in his deviantART gallery.
Loston Wallace is a freelance comic book artist and illustrator who has worked for DC, Marvel, and several smaller comic publishers. You can find more of his work in his deviantART gallery.
Sarah Beth (AKA 0XsarachanX0) is a “cute and psychotic” digital artist from the United States. Check out more of her work in her deviantART gallery and Tumblr page.
Arielle (also known as X-Arielle) is an artist who, as she likes to put it, “likes to draw sexy ladies.” You can find more of her work (some of which is slightly NSFW) on her tumblr page and in her deviantART gallery.