This is 50 x 50; avatars can be as large as 64 x 64. So, that leaves you with an extra 1596 pixels to work with.
I think this is not bad, personally, even though it lacks detail. I like the diffuse brightness of the central... object.
"Months" seems to be more realistic AFAIK B/W PA producing :)
mmh well, the point is that it's also an avatar, so 100x100 is too much, BUT I'm also preparing a very big thing for the next days(months XDD)
Just do something, maybe make a big 100x100 lolz, I'm making some stuff but I'm lazy... >.<
It needs more stuff. lolz, like more of the cavern showing. :D
here on pj avatar can be 64x64, but on dA they must be 50x50, so I worked with that restriction