Yeah, it didn't come out as well I had hoped. I'll keep those tips in mind for the next works I do. Thanks~

The lines are nice, but I think the color palette is a bit too greenish/grey for a moon. I suggest to use one shade in the palette which is more golden instead of 'dark yellow'.

As well I see you dithered the darkest shade. The problem here is, that the dithering is very irregular. Try to make dithering more symmetric/regular ;-)