[Kimberly Dow]

This is just me, but I would go over and have them sign a standard model release form - and if they do not want to - then do not do them. It should be two separate contracts - one for the commission and another for modeling and the use of the photos for your own figuratives.

There is a huge gap in a person's thinking - being a client who hired the artist and being a possible model for a separate painting. You have to please your client and that is one of the basics of your relationship. With a model they sign away all rights and have no say at all. If you try to do both at the same time - it might be confusing for the client.... they might want a say in what photos you can and can't use. If you really want to - I'd wait until your commission is finished and delivered, then approach them about it.