Spider-Man versus Green Goblin
When I first used Medibang Paint, I initially assumed that I can color pictures that I already drew by hand and then scan it into my iPad. Unfortunately I realized that the app does not count the whites of the picture to be transparent, so if I paint, then the color will cover the picture too.
Fortunately, I found a way sort of around that issue. I can lower the opacity of the paints and then I can color the picture without it totally washing out the details. Of course, the downside of this technique is that the coloring is splotchy and uneven. This was a quick paint over; more of an exercise of how my black and white picture looks like with color.