It makes me really happy to see fanart of these two! I love the Yoshiwara arc a lot Really great job on this, I love the lighting and colours. Nice work on Hinowa's kimono too!
btw just to clear up something: Hinowa, Tsukuyo and the other women in Yoshiwara aren't geisha. The Yoshiwara in Gintama is actually based on the historical Yoshiwara pleasure district in Edo (modern-day Tokyo). Here's a short explanation on how they're different: www.slate.com/blogs/quora/2013…