So I have been watching a lot of angry mikkos on you tube. He is my go to artist. He speaks a lot about being at peace, drawing and painting within your happiness, and he is really great at environments. Nothing like is name seems.
The reason why I am sharing this is because I too live in the self-doubt world. Battling back-and forth.
With that said I think you are still early on your piece. I've experienced this same feeling like it doesn't seem like it is coming together. Keep at it, stick to your perspectives, and let your creativity free.
I see a lot of potential in this piece. Please don't doubt yourself. Your art is how you see the world. Your creativity is the music of your being. Let it play and enjoy the process.
These are my reminders I tell myself and I hope something in here will help.
There will be times where you will have to rework a lot. The there will be times where its easy.
You're not alone!