I think since you're painting more "flowy" stuff like that you should stick to the "normal" paint since Acrylic is harder to manipulate once it starts drying.
Not that you can lift normal paint but you can still move it around a little once it's dry with water or more paint if you really needed too. Plus Acrylic is more expensive D: all you can really do to fix something with acrylic is to add more paint, which can make it heavy.
My favorite is watercolor, I have a set of tubes with a lot of different colors and they'll last me forever, since you don't need that much (and you can lift it ^^) It's different but you can control the thickness of it if you wanted too.
(one of the light bulbs in my room blew out -_-)
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