There are several photo sharing sites which allow you to have free accounts. I use Flickr (pay $24.00/year, but free account is available), Deviant Art is popular here, Rendosity allows picture uploads...
On Flickr I open my full size pic. At the bottom they have link info that can be cut and pasted to different sites. It's an easy way to share on this forum.
You might try setting your atmosphere samples to 64 (Quality tab of the shader). I'd kick the edge sharpness of the clouds up to about 40. From what I could tell, this is a good image.