← B brush · E eraser · T text · P panels · M/L/W select · Ctrl+T transform · [ ] size · Space+drag move
Size
Opac.
Enter = new line · Esc = done
Transform

Adjust

Changes the layer you're on, or only the selected area if something is selected.

Adjust

Brush editor

Tip from my drawing: draw a leaf, star, splatter or hair strand, select it, then press the button. Dark parts become solid paint, light parts fade out.