For this piece I thought I'd show a bit of my process. I wanted to produce something with a definate sense of scale and depth (something an earlier painting lacked which irritated me). The floating rocks are a little fantasy cliché' but it was another means to convey a constant feeling of depth.
In terms of process I tend to start with a sketch, then through in some tones in grayscale before roughing up some colour and texture over the top. I rarely go with texture ideas so early but in the case of the rocks it helped the scale and perspective as I painted into the piece so it helped in the end :)