Using the same idea as the ‘Eyes’ painting (water mixed with paints) I painted a background in blue, orange and purple then used a slightly damp brush to blend them together a bit.
After letting it dry I used more wet paints to paint the tree itself and the few other features of the painting.
The water had an effect on the card I was painting on and the corners started to curl in a bit so there’s a shadow on the right. I should probably practice my photography as well.