Old project that I somewhat restarted.

[DioShiba]

It's good for a start. But it feels flat.

I wonder what would happen in the case that you tried utilizing the colors being used as a light source and add a color that would help give it some ambience. Since you're not going by any sort of palette restrictions you might be able to get away with that little extra detail.

I would also be curious to see what might change if you put anti aliasing in some spots of the door itself. Consider experimenting with this a bit further.