It's a beautiful piece.
Sad but true, the right forearm and hands are weird. Try positions you are more confortable with.
You can find some inspiration with Andrew Loomis:
https://www.artsartreviews.com/wp-content/uploads/2016/08/Andrew-Loomis-Drawing-the-Head-and-Hands-132-1024x706.png
The stick ends weirdly too.
You shall edit it, it will be a master piece.
Thank you for your criticism. The hands, fingers and wings' problem are found by myself. But something I don't know how to fix it. I will try to fix the jagged line first.
They seem to have a claw hand. The fingers would probably be visible at this angle. Both hands are also quite small. The hand on the staff also doesn't appear to be holding the staff, but clipping through it.
Aside from the hands and some jagged lines on the wings(?), this looks quite good though! The details are surprisingly readable for how much lineart there is.
That are good advices.Thank you so much