It looks like she's using a particularly unappealing self-created shade of brown-gray (or maybe it's just the rinse water) in this one.
Anyway, as you can tell by the picture above, our prior solution for not getting her clothes completely messy was to let her paint without a shirt on. Grandma Pat got her a smock to solve this problem. Thanks, Pat! Amelie calls the smock her "painting dress."