Nice progress, I have been following your posts for a while now, and you have an awesome work ethic.
I would suggest doing thumbnails and quick sketches before you begin on a piece.
If you haven't seen them, check these out:
Gnomon - The Techniques of Dylan Cole
All of these are good, but in Volume 3, he does through the entire process of creating a Matte Painting.
Gnomon - Matte Painting for Film With Chris Stoski
This one goes over the entire process, using Photoshop, 3DS Max, and Vue.
This is a small gem a friend of mine showed me by Mickael Forrett.
Great work, looking forward to watching you progress.