I want to avoid cutting through the studs supporting the window header above the sink. Many of the plumbing diagrams I've seen cut through multiple studs. This layout would only require holes for the 2" washer drain and 1.5" sink vent in one stud, but I'm not sure if it's laid out correctly. I think I may need a clean out for the washer too, but not sure where.
Are you adding the piece that loops around your sink? It's redundant.
You need a P-trap in your washer line to prevent gases from backing up into your washroom
Otherwise, what you have drawn out is fine. No need for a clean-out.