This was a very fast sketch I did for a job a few months ago. It was one of a number of sketches cranked out to kick off the design process.
You may notice the painting is a little "rough around the edges", but as a professional concept artist you're expected to generate 5-6 sketches like this a day - so there's not really time for all the nice touches one would like to add... It's about presenting a range of ideas, as opposed to making beautiful artwork
The design was not used... but I kind of liked it!
The story of my life...
Photoshop - working time ~1 1/2 hours