So much for my idea to get this moving. (Excuses, I have a lot - though none are good.) On to the question. I thought this was going to be very difficult, but I really got thinking about it and suddenly remembered this picture and…well.
It is fanart from Magic Knight Rayearth, featuring Umi, Hikaru and Fuu - as well as Mokona and Primera.
While I do like the artwork from the series, this is such a beautiful piece that I cannot help but to adore its uniqueness. The girls all look lovely, and so very happy. (Even Umi whilst she chews out Primera.) I would have to say that my favorite aspect about this is their hair. I really like the style it was drawn in. Also, the interplay of light and shadows just takes this work up several notches.
So, there you have it - my favorite fanart from a CLAMP work.