Hello Jack, my name is Ann, the scope and premise of your project sound interesting! I specialize in character illustration, but I also dabble in backgrounds, if at all possible, I'd love to work with you and your team through one-time payments (assuming it's alright to go through fiverr, for the safety of my and your transaction)! I can do backgrounds for $90 each, but if need be, we can also split that payment up into smaller milestones :)
(And while I acknowledge my backgrounds aren't quite the same genre, they're some of my proudest pieces and I believe I could capture the feel your team is looking for really well!)
If the job is still available, I can be contacted by email at: commissionsfanntasiacorr@gmail.com
Or I can also be reached by DMs at: https://www.fiverr.com/fanntasia_arts?public_mode=true
