So one thing I will say is that the nature of this one is a "vent" artwork, as are a lot of mine because art's a major comfort thing. Didn't expect the "vent artworks" to be noticed, but oh well, though I do love this one.
Now onto analysis!
So, basic version is the person, likely representing me is split down the middle like cracked glass. I use glass a lot, whether in poems or art, as a sort of representation of mental health or headspace, especially when in a lot of my poems I started comparing myself to glass, easily breaking. Then the split itself, two sides, night and day, bright and dark. Brighter is the sort of thing everyone expects a person to be happy in, but it's not.
The night side is calmer, more peaceful, and more welcoming to laid back relaxing or fun.