Missing alt for pictures when using /bookmark + missing H1 for tags and authors


I encountered such a problem and couldn’t find the solution myself. We have a GhostPro blog - https://designscrazed.org.

When I use /bookmark to insert the snippet for another article, it shows an error in Ahrefs (missing alt text for picture). Could you please help me with resolving this issue? Is it possible to add alt for such images?

And also, H1 tags are missing for tag and author pages. Is there a way to fix this too?

Thank you for your help!