Modly mod here, and that is gorgeous, I love it. :D
I think tumblr dimensions are 500xstuff? But I can always size it down myself when I make the post.
My only possible suggestion would maybe be including "Nominations open August 1" as well, since you included signups (which I think is a great idea). To avoid people (who only look at the banner without reading the text that goes with it) thinking nothing will happen until August 8 and then being all "but I didn't nominate the things I want!"
Re: Exchange plans - schedule
I think tumblr dimensions are 500xstuff? But I can always size it down myself when I make the post.
My only possible suggestion would maybe be including "Nominations open August 1" as well, since you included signups (which I think is a great idea). To avoid people (who only look at the banner without reading the text that goes with it) thinking nothing will happen until August 8 and then being all "but I didn't nominate the things I want!"