Its alot messier than the last pic but I just really trying out the custom brush settings and getting a feel for them. Also trying out blending colors in Sketchbook.
Unlike Photoshop you can't directly manipulate the brush eg: opacity and flow and whatnot, you have to go into the brush setting which is quicker in Sketch than in Photoshop which is a plus. I also found out you can also use ALT to select a color … stupid me, should of read the manual ;)
Greetings
Nik