I really like when people do game concept art, this looks great! Super happy someone did a retro Gameboy submission. Did you use a color palette, or make your own? This almost looks like a Nintendo GB color palette I found on color hex a while back
I use Aseprite do to my pixel art and it has a Gameboy color palette in it by default so I just used that. Thanks for the compliment! First time doing stuff like this.