Repainted the brown parts darker and blending in some lighter colours into them. I then started to use a pallet knife to get more texture of a lighter green, making even more of a contrast between the darker and lighter colours. I tried to use as much as I could without having to wait for it to dry to use more, so it would create a shadow underneath. I was considering of painting on some darker lime greens but by using these sculpted shadows solves this problem.
I then measured some canvas and started stretching it.