Its a good start, but you should try avoiding the "banding" you are getting. Use a different brush, or use bigger strokes. Also try to define the terminator a bit more. Also try to add reflected light in the shadow side. The falloff in the lit side doesn't seem to realistic, spread it out more evenly.
cheers for that ive already had a play around with it before i saw this message, but i can still change the lighting here is what it looks like with the detail
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