I made a watercolor brush when i was bored but idk if there is someone who already made it. but i hope u like it :3
(i reupload it to make it free )
As u can see if u color in the same coloring layer it will blend and if u create a new layer as u can see it will the lighter color will look clearer but it blur too
there is how it blurs with colors. as u can see both blurs even if u start with the lighter color first 
there is an example for another way of using it :
here is a quick drawing using the LBwatercolor brush (kinda cringy name tho :D ):
Max size :2000.0
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