You need few code customizations to achieve these changes. If you are looking to hire, please create an account on our website https://www.pasilobus.com and you can submit your request from the dashboard.
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Hi @Joostos keep posts to a single issue, glomming multiple things together just makes solving singular issues harder because your topic isn't relevant to a specific thing other potential contributors could help with so they never even read your post.
Making ALL images be clickable is an advanced theme customization that would require modifying a lot of the theme.
If you need the advanced customizations built you can contact me by mail for services. ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail. Contact info in signature.