Well, I did the drawing myself, but the coloring is a whole other thing for me. I had a friend color it, and then I inserted the title and the other elements. You can ask on Fiverr or someone from the Tapas community to make one for you, it's not that expensive. On the other hand, your current cover is great! I wouldn't wanna change it if I were you!
Thank you for your reply, I will definitely check your story!