Step 1- Using a large soft brush, I add a dark red base, then use a soft eraser to get cut out a simple shape to start from.
Step 2- On a new layer above, I begin to add various shades of red/orange. Same soft brush used, and I use the eraser once again to bring out the shapes.
Step 3- On a new laye above, I use a hard brush and add the details, using light orange. I add simple lines to the rocks to add light.