It will be good if outside links in posts can open in new browser window, so you don't leave community page when you click on link. My second comment is if user doesn't upload his profile picture maybe you should use some default picture. Currently it looks like broken picture link.
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https://dev.community.intersystems.com/post/links-posts-and-profile-picture
You can get the link to open in a new window. Here is how to do this.
When defining a link in a post with the Link pop-up window, the "Target" tab has the "Target" drop-down list. Select "New Window (_blank)" from that list.
I know that this is an option, but usually users doesn't care much about that how provided link will open. Maybe will be better to solve this on system level and set parameter (if exist) that all links inside posts open by default in new window.