Photoshop Workshop - Layer Masks

The next ting I really enjoyed learning about was using masks. I took the line drawing I'd already made and added a new layer of gradient. I used purple because it's associated with hippos and it's my favourite colour. I then added a mask to that layer and used a brush tool to paint on top of the mask to erase areas where I didn't want the colour.

You can always disable the layer mask too if you decide something's gone wrong.