**This is my second gfx ever and what should I change and how should I Improve?
Maybe make camera closer to the character, the gfx has a lot of empty space, you can try to add more stuff. But totally it has good lighting and idea. Goodluck!
It looks very good and I really like the lighting. But you could make the character a big larger or like @Lie_Star said make the camera closer to the character. Good job for your second GFX!