I added a Hue/Saturation layer and a Levels layer for the coloring, and two curves layers: a really light one and a really dark one. I went in and brushed out sections in the curves layers to make it pop.
step 4 of 7
I found this fine background from Argenberg on Flickr. (Thanks!)
step 5 of 7
Put our sun friend in the background.
step 6 of 7
Did some detailing around the feet with brushes and added shadows and places where the dirt pushed up around the feet.
step 7 of 7
Did some color work for the background with curves and hue/saturation layers. I also created dark and light curves layers and brushed in affected areas. I painted in the footprints with brushes as well as highlights on the metal.