Need Experienced Anime Map builder

Hello I own a game similar to Sailor Piece, i need 7 islands made for it around 850x850 for each main island, the islands all have different themes some based off animes, jungles, volcanos etc. I Am only paying after the task is complete, % can be negotiated if you want to do long-term. I Need this done within 2 weeks (Around 7 Islands maybe more as time passes will pay ontop).