This is Mirin's latest set featuring Yuzuruha from Muramasa: The Demon Blade. Mirin scammed me out of $2000 worth of commissions, and has made it clear that he has no plans to do the right thing. I'd recommend that you don't comm him, but if you really want to use pixiv request to ensure that you get what you paid for in a timely manner.
As an aside, and this is somewhat petty of me to reveal, but evidently this is one of the supporter suggestions Mirin took this month. If it's anything like the last time he took supporter suggestions, one was probably a gift for a friend and the other two are hand picked based on what interests him. To be clear, I don't think there's anything inherently wrong with that, but presenting it as a 'random chance' to get lucky and have your suggestion picked is disingenuous.
EDIT: Evidently Mirin is going around saying that he never agreed to take these commissions, and that I sent him the $2000 without his consent. Here is one example of him admitting that he owed me multiple commissions, and that he viewed the money as commission money.