A new layer filled with radial gradient dark and light green.
step 2 of 7
I selectioned part of the thorns; copied and pasted.
step 3 of 7
Using warp tool, put some curves.
step 4 of 7
Following the reference image, I created the mane - a lot of copy and paste process! When I was done, I merged the layers.
step 5 of 7
I duplicated and resized the mane layer three times; one to give more volume to the mane, the other two for body (applied a bit of gaussian blur to give depth). With soft eraser removed unwanted parts.
step 6 of 7
Over those layers, I created a new one and filled with orange; changed layer blending to overlay, adjusted hue, saturation and lightness untill the color approximate to original.
step 7 of 7
On the top of all layers, I drew a ellipse; picked up the face color of the reference image and filled the ellipse. Then using burn and dodge tools I drew the details of the face; with a soft eraser, I removed unwanted parts. Smudged the edge of mane.