From a purely personal point of view, I think it would be good to have a bit of alternation between OFDWs. Maybe focussing on a mastercopy one workshop, then painting from reference the next, and maybe something themed after that, or mixture thereof. The way I see it is you get a good range of benefits from the various disciplines, and the more immaginative threads might give you a chance to put into practice the techniques and skills learned through master and reference copies. But then I’m a fairly varied artist and mixing it up like that is good for me, and keeps me interested. I think if you do mix up the reference and master copies within one thread, again, from my point of view, a smaller number of pictures works better, say a maximum of four, as it gives me more of other people’s work to not only compare my own against, but to see how others tackle the same subject.
I like the idea of having an environment and placing a figure within it, this would be great for those who want to try and get to grips with working with the figure when you don’t have a specific reference.