If someone takes the time to help you make graphics, the least you can do is to give them some credit and pay them right? Don't worry, it's not actual money XD
✎ Give the graphic maker credit
✎ A permanent follow on this account (GraphicImagines) and on the designer's account
✎ A nice comment on one of the designer's books
✎ Must use cover for at least a week
That's all you need to do :) Have fun and thank you for requesting and shopping in the Imagines Market XD