I think, this group needs an icon. It is really helpful, because it shows every newbie, who has not yet joined the group, what it is about. I also think, you should make the banner image larger (about 1000xwhatever), so we have one image and not five or six.
Here are a few icon ideas:

Those are just a few ideas, but I think, they could help.

I vote for the first one.

4677183
Same here. I think it shows the contrast between the two Equestrias quite nicely.

4677418
Thanks. As I am not the admin, I can only suggest that.

4677180
The last one or the first one.