You should consider taking comissions. You can give a huge discount if you're allowed to use the result for your next post.

"Hey @ykdesign, can you do an image using pictures x, y and z following -thematic- detailhs? Oh, you charge 10 sbd? Hmm... Oh you can do for only 2 SBD if you can use it for your next post? Great!!"

A little side hustle you can use to lure in both followers and actual customers. If noone make requests, you just do your regular routine.