Adobe Fresco offers a new suite of tools for artists, that simulates watercolor & oil techniques realistically as described below

https://www.theverge.com/2019/8/12/20794481/adobe-fresco-hands-on-painting-app-ipad-pro

https://www.adobe.com/products/fresco.html

Built for the latest stylus and touch devices, Adobe Fresco brings together the world’s largest brush collection with revolutionary new technology to deliver a natural painting and drawing experience. For artists, illustrators, animators, sketchers, and anyone who wants to discover — or rediscover — the joy of drawing and painting.   Work with watercolors and oils that blossom and blend at your touch. Use vector and raster brushes together on the same canvas.   Users can easily export projects in different sizes and formats, including PDF, PSD, and PNG. And because it’s part of Creative Cloud, all your files, brushes, colors, and content libraries are always just a brushstroke away.