That is an interesting question Dzhugi asked. How does the collaboration process work? Do you do the inking, or the tech work on your Mac, or something like that?
Sorry, I have him on ignore and so all I got was "This message is hidden because Dzhugashvili is on your ignore list." The level of collab varies depending on whether it's one of my pieces or a commission piece.
My pieces, I'll either find a general pose idea from existing art or create something using Poser (a low-end 3D program, for those not in the know). I also look up references of any canon characters for her, actors/actresses from non-comic based art, etc. From there, she does the sketch either via OpenCanvas or on paper and scans it, and I begin the flat coloring. While she's inking (either digitally or by hand), I finish that and then it's layered over the PSD I make. Then I clean it up a little, we double-check to make sure I read all the parts correctly (like the part I colored as X's clothing doesn't belong to Y), then she adds the shadows and highlights. I'll save out and upload a copy to my server for posting at our mutual haunting grounds, and depending on which of us is having the least problems with DeviantArt, one of us will log in and post it. Although with my stuff, I generally end up going in to edit the descriptions with character information and history.
Commission pieces, I'm generally the front end as far as payment, questions about what's allowed, etc. I do represent myself as her IF someone doesn't seem to connect that my email is "Joseph" and the artist is "Skotti" (and yes it's happened), but with her permission and just to keep people from trying to end-run me and bother her with the things she wants me to handle for her. I generally don't touch any of the coloring or reference work because the commissioner provids the refs and she'll have both my and someone else's projects going on at once, and so my attention is on my stuff.