The sketch step by step is in the previous post.
Stage 6: Don't forget to flip your canvas to spot mistakes (and don't be too lazy to fix 'em once you see 'em :P). As you can see I started shading the characters one by one after I had done the color lay-in
Here's more refinement on the characters. You can see I slightly started changing style since I painted Obi Wan, I'll have to go back over Count Dooku to match him up with the other characters.
Stage 7 : Worked on the background, since I am on a tight deadline I am not going into detail, just general shapes since it's not really the focus anyway. I might refine it later if I decide the image is good enough. But greyscale is done.