Just finished this...



Sorry, wrong section. Could a mod move to Edited, or wherever...

Here's a few shots I happened to save during the time I was drawing it...

I began by drawing the basic shape (along with panel lines) using an existing plan view drawing:



Then I added some basic colour:



Then some shading (use of gradients, feathered selections, etc):



And then the finished article is above - added markings, more shading and highlights, dirt, and extra details.

All done in Photoshop.