WOW great work.this is very underated.to increase its score id do 3 things 1)Get a bigger pic,its hard to see details at the mo.2)take the photo with awhite background Ie get piece of white paper behind it and 30 do something else about the base.i like the 'mars' like idea but it neds something else.Either static grass that may not look to good or what i would do and add in some larger rocks Eg slate.
I hope you keep improving youve got some skills definatly :)
james