There's a FB page that uploaded your work without credit (using the lame "help us identify the artist" sidestep). Have fun. I find such pages extremely annoying when I am looking for live models or artists to commission (in addition to the lack of courtesy in identifying the content creators).
I love this one, it's the hit in the jackpot. Everything is perfect here, Marceline's pose, outfit, face and hair. Also bakckground is lovely! I also love how you made Marceline looking rebelled. She really looks like a vampire rockstar here!