It is somewhat of a pain to have to go to the control panel every time when I need to update the status of who I owe art to as well as other things. Maybe adding an option to include a separate area just for that.
Maybe have a dropdown list of the people who watch you and those you watch. For those who aren't in those lists add a text field you can just type their name in.
Say that I owe someone art:
I would have 2 options on where to add their name: whether it's a wip or if it's finished.
Maybe for those who collect money upfront could have a 3rd option of selecting if that person paid 50%