I love the idea of this account. You already have most of the DM artists I adore the work of already listed here, but here's a few others that I like in case you're still looking for suggestions:

My dear friend Kathie is one of the kindest people I know and also has a wonderful painterly style of YGO art that I really think stands out. She's done many works of Atem/Teana, but also has other ships like Yami/Anzu, Seto/Kisara, Marik/Bakura, etc., in her gallery.

The universe's gift to Copyshipping (Jounouchi/Anzu/Mai), but aso has lovely fan art of Anzu/Mai, Jounouchi/Anzu, Jounouchi/Mai, Jounouchi/Valon and Valon/Shizuka. I always love seeing new work from this artist.

Has some lovely work of various ships involving Yuugi, such as Jounouchi/Yuugi, Atem/Yuugi and Anzu/Yuugi.

Has beautiful paintings of various DM characters and ships, particularly those based on the Duelists of the Roses game.

I think this artist has mostly moved to tumblr now, but their account still has some stunning pieces featuring the Marik/Bakura and Marik/Thief King Bakura ship.

For many years this artist has been one of my favourite accounts for cute and funny Yami/Seto fan art.

Another one of my favourite Thief/Citronshipping artists.

Has some of the most expressive and energetic Marik/Bakura fan art I've ever seen.

As well as lovely Ishtar family artwork, this artist also has really nice Ryou/Shizuka and Marik/Anzu pieces.

Moving onto the artists who I'm not sure are active any more, but still have nice work in their account. Definitely one of my old favourites for Seto/Anzu, but also has fanwork for many other ships, too.

Has fantastic work of so many rare ships.

Not really so much shipping art, but has a lot of nice Mokuba fan art.

Cute art of various different ships from DM and other YGO series.

I'll stop there for now, but I hope there are at least a few good suggestions on this list.