Hello, sorry for a little late response.
I'll be happy to take on these commissions and working with reference is fine by me, I've done several pieces by now where clients provided a lot of references & text notes which was actually kind of fun.
Though I'd add that lately I've not been feeling that great and it's been affecting my productivity - Currently I'm only finishing one commission per week (Which might still be reasonable but in the past I've been doing one commission almost every day ;-;)
If that all sounds good you can shoot me up a message with details and I'll do the sketch right away.