Most pens aren't really the best choice for coloring materials. I usually color in with colored pencils. I'd recommend crayons, colored pencils, or watercolor. As for markers... I've never actually tried coloring in with markers before. I could try, but mine are thick and watery and aren't the best for coloring. If you want to color in with markers, color in using markers that are good for coloring and aren't too watery or thick.
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Art Tips For All Ages
RandomNote that I am a HOBBYIST, not a professional. There are a few things that I cannot draw. However, these are just some quick tips I think will be necessary. You do not have to use this though. Exaggerating the anatomy is not a wrong. There will both...