If you're willing to compile it, Aseprite is a great option as well.
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Check out a brilliant guide to painting heads of stylized characters in ZBrush and Photoshop like Bob Ross by Danny Mac. There are tons of ways here and this guide focuses on one of the possible routes which can save you some time.
Concept by the awesome Angel Ganev
Intro – 00:20
UV Master – 01:05
MultiMap Exporter – 05:40
Setting up The Model for Painting – 07:18
Colour Zones of the Face – 08:09
Classic Texture Export – 09:08
Creating our Base Map – 09:50
The Sell – 16:46
You can also get the bonus content for the artist’s tutorial on Gumroad for $12. Make sure to share your thoughts on the techniques from the video in the comments below.