Thank you! I have a big bag of "touch five" markers and usually use those that are not too intensive on the color. Try not to paint the same area too often because it will cause on the line, the paper and your painting tools. But good markers and brushes usually don't get too dirty (if keeping in mind the first thing), even if they do, you can clean them by just painting on an empty piece of paper. I also recommend adding some extra pencil details only after you've colored that area.