I checked out your profile, and it seems like you're a really artistic person, with lots of different ideas, so I can see why this might be a difficult decision for you. I agree with duffsmom, keep the last name close to the beginning of the alphabet. Furthermore, make it something different enough to be remembered, but "normal" enough to sound credible, if that makes sense? Based on what I learned about you on your profile, here are some ideas I think you might like?
Juliet Adamma (something similar to your real name + "beautiful girl"
Mayu (which means: true, full, gentleness) Jude
Just some ideas- I hope you find one that really fits you!