Am I in the right place?

I'm new to crafting as a hobby I'm more of a woodworking type. However universal studios has this thing where you can hide homemade crafts for people to find, and I'm doing it in my next trip. My idea was hogwarts house bookmarks. I'd use tongue depressor wood, a hole at the top for house colored ribbon. Random color for hair, then googly eyes. The tricky part for me is the rest. My idea was to paint a majority of it black for the robe and a portion for a house color. My issues are that yellow doesn't show all that well, and the other colors tend to bleed/run to the black. I'm using paint pens from craft smart for the other colors and plain black craft paint for the majority black part. Any suggestions on how to fix the issue?