At the beginning of each month, I'll evaluate where I am with my time availability, and what sort of personal and promo art I'd like to be working on, and devise an update schedule for the next four or so weeks based on that. It might very well be that I'll decide to do a sketch a day one month. I might also decide to do a larger painting each week, or perhaps just work to complete a multi-piece project by the end of the month.
I don't suppose my subscribers have any preference for seeing me work on sketches or finished paintings in May?