Most of the time, I can't think of anything to say, so I just leave the description blank. But sometimes I use it to comment on some behind-the-scenes info or poke fun at my older pages, lol.
Sometimes I wonder if I should try and come up with commentary for every page? But like I said, sometimes I feel like I don't have much to say, or that my commentary would detract from what's going on in the comic. So idk.