Hey, guys. I’ve been drawing on my own for 6 to 8 years. Recently, I took a step back and realized that I’m progressing too slowly, and perhaps progressing poorly. I want to be at least at a lower professional level by 2018, and if I want to get there, I feel like studying on my own with no help won’t cut it anymore
2016 has been a productive year so far, but this picture is the first one I’ve just been unhappy with despite spending more time on it than usual.

I did self-critique, but I don’t feel like I’d like the picture even if I fixed everything I critiqued. Additionally, while I don’t hate anime-styled faces in general, I regret using one for this picture. Using a more realistic style would make it much easier for me to see where I’m screwing up.
That picture took me 12 hours. I know speed comes with time, and I was doing several things I wasn’t accustomed to doing, but that’s just ridiculous.
So I need help. What’s wrong with the picture that I couldn’t see, and what/how should I practice in order to fix it?