I will echo those you mentioned, Kasei, especially Tigon and Timali.
Criquetin & FireLemming were my favorite artists...I miss seeing their work quite a bit. Snowy and Va-Kasi as well. I also cannot forget Akril for her thought provoking art about canon.
I'd say those were really my core favorite artists.
As far as a favorite picture...I'd say this one
had really stuck with me.