I don’t think one extra step would make it useless… but I understand why it wouldn’t be an option. If it’s not an option, they should really make a better way to format the email. Fonts and pictures are always in the wrong spots, making it hard to read.
As yours is a photo-blog maybe sending out a brief teaser and link in your RSS feed so your readers click in an view the images on your blog is a viable option for you. You set your RSS feed to summary rather than full post here > Settings > Reading
For each article in a feed, show