The Brush Tool
The Brush tool is a basic painting tool. It works like a traditional drawing tool by applying the color using strokes. It’s located in the standard Tool Bar and its default shortcut is the letter B.
I applied the brush tool on her hair, eyes, mouth and whiskers. To do her skin, I applied a leopard pattern.
The Brush Tool works by adding a shaped mark on a layer, and if you continue pressing the mouse button or the pen on a tablet, several marks will be added creating a stroke until you release the pressure. Here is a tip for you: The essentials options for the brush tool are: Brush Tip Shape, Blending Mode, Opacity and Flow. Have fun!