You are mentioning two different issues:
- The two screenshots are from the Pocket overview section. In most cases images do work properly there (even with acoup), and in most cases it's just a sync issue. I've had the issue that the same image will be displayed in the overview but not inside the article due to being a PNG
- Sometimes whole sections and/or images are missing from the article. That often happens with <code> sections, movies and advanced <picture> elements. In those cases you're right, there's not much we can do as that section is simply not there. If you check with the web view however, you'll notice that the same section is missing, so it's more likely a Pocket issue than a Kobo one.