I just realized...

that the slidebar at the bottom is the brush size adjustment. you should make that clear in the ui.

i also need a zoom function for getting the details.

one more request. can you put edit/save(or view) toggle button somewhere at the edge of the screen? I keep on double tapping back from full screen, accedentally giving an extra tap, and getting a blob in the center of my finished work.

all that, but great app none the less

muhhy about Holograms