One random suggestion: Maybe you have a reason for not posting a caption, but the photo group gets so many emails a day (in addition to the other emails I get) that I tend to ignore most of the emails, find the links to the pictures, and start from there. I end up losing all context of what this photo is about if I don't read the email. Maybe you could include a quick blurb (since you already typed something for the email, maybe just copy it here?).
Love the ComiCon shots. Keep them coming (don't stop, like your email said!)