Looks like peach leaf curl to me, to late to do anuthing this year look up peach leaf curl and put together a spray plan for next year otherwise grow it out should be fine. PLC is a major peach issue in pnw is easy to deal with but requires proper timing of sprays
I had terrible peach leaf curl the last two years. This March I sprayed Daconil and the leaves are looking much cleaner and nicer so far. I plan to continue to spray the Daconil (active ingredient is chlorothalonil) every March and was told that if the peach leaf curl really seems like a major problem going forward I could add some copper in fall, too. Good luck!
I was advised that depending on how advanced my trees were, I could spray copper still this spring as of April 11, but at that point my trees were pretty far along and I thought it would not be wise. Apparently, one should avoid using copper after trees leaf out. It will burn leaves if you do not use the right ratio.