So I recently commissioned an artist for a commission roughly a month ago and recently came across a journal of theirs saying they were changing their prices for the new year. Now normally that wouldn't be a big deal since price changes are usually going up so it'd be me getting a commission in cheap before the price raise. However this artist ended up lowering their commission prices. So I originally paid $60 for a commission and the artist lowered that price to $40. My question is is it alright if I asked for a refund on the remaining amount?