I think you did an excellent job. His hair is so wonderful-- it's different from the original, but definitely reminiscent to canon.
I think you've got a LOT of wonderful colors layered here, and I can see the brushwork. It's got a very nice feel to it. The color palette~ it is lovely. Very soft gradation, but raw and brilliant color and brush strokes.
Thank you! I'm glad you like the colour use, I still have to put a lot of thought into skin tones (and had to redo his skin several times) but I'm glad it seems to have come out pleasing in the end. I'm also glad that the brushwork is still apparent. I really didn't want a flat look for this piece, partially because Grell is such a vibrant character that I feel he needs more volume than that. Retrospectively I think this picture would have looked a bit better if I put his jacket on him (the one from when he was training at the academy) to add a bit more variety but I am not yet that bold not confident with drawing material haha ^^'