I just thought i'd do a quick overview of how i put this sketch together.
Thumbnail Sketch - Just trying to get the general idea. Not worrying too much about perspective, just want to get the idea out.
Rough Draft - Figuring out what sort of shapes i want, paying attention to larger details, architecture, shapes of rocks, large plants, etc.
Cleanup - Cleaning up everything from the previous two steps, also adding smaller details, cracks in the rocks, smaller plants, also checking perspective.
Pen/Inking - I call it inking, but it’s all in photoshop and i’m mainly cleaning up the linework so it looks pretty. Adding a few more details, but making sure the textures all look right, and generally just making sure the linework looks nice.