Nanami, I'm also having massive problems in the last few days. Even on laptop it's slow, but some features on mobile don't load at all anymore (round pen)
Poisonous training if tracked correctly is not excatcly yay. Going from 5/6 w4 to 3/6 w8 is not amazing. But certainly worth trying a top boy to see if her training is deceiving
Overall, I really like this piece. It looks as though you used a very large brush. I would recommend that you use a smaller brush to do the small details like the eye, mane, shadowing, and highlighting. I think the main thing that would make your piece better is to really focus on shadowing and highlighting. Shadowing will held separate the head from the neck and stop them from blending together, like Nevermore stated.