I like it, a lot!
That sun is amazing. o:
The background would look better with a dithered or patterned gradient, I think. Right now the shading has a metallic-looking texture.
Not so sure about the ronin, I wonder if he could have been red? Or else, a bit closer and larger?
Mmm, very clever use of the palette.
Love the "simple" style. something about it just makes me love it.