You say you intend to improve your mental health, but I think you know that you already are improving your mental health. You reached out for help. You wrote about it. You drew a beautiful illustration of your emotions. I have dealt with depression for many years. Everyone's struggle is different, but it takes strength and patience to hold on when you feel despair. It never feels courageous at the time, but it is.
What many people don't realize is that to survive the darkness of depression, we also have to have a light inside us. And the light is brighter than that darkness. It often doesn't feel like it, but it is.
It sounds like you already know these things and are taking the steps you need to get well.
One thing I have observed: people who understand depression understand. Others simply do not. They cannot. It is easy for such people to judge, and we, being depressed, can so easily buy into that judgment and turn on ourselves. I hope you choose to be compassionate towards yourself instead. No one knows what it is like to be you.
To help myself, I sometimes try to consider what I would think if I were watching myself. If I were somehow able to separate from myself, and the compassionate me, on my best day, could talk to the me that is in despair on my worst day. What would I say to myself?
I have worked on a suicide hotline. A psychiatric nurse once called in. She was acutely suicidal. I asked her what she would say to a patient who said to her what she was saying to me. It was interesting because she immediately moved to a place of deep compassion and understanding. She started to realize that she deserved patience and kindness. When she thought of herself as a stranger, she started to be kinder to herself. Isn't that interesting?
I don't know if it is helpful to you. It sounds like you are already on the right path. Art and creativity can be such beautiful releases. I think it will help as you continue on this healing path.