What about Comments and a Favicon?
Check out the comments on some of the posts/pages. Are the comments being answered? Is the website owner correcting grammar and spelling before publishing them? These make a big difference in terms of the trust of readers as well as in Google's eyes.
Has the website owner changed the author from "admin" to the name he/she is using on the website? It really makes the site look more professional and gives the readers more trust. If not, here is Kyle's tutorial on how to do that:
Is the website owner moderating the comments? Are there comments that don't really give any value to the site? If so, give your opinion.
Is the website owner using a favicon? (A favicon is a small image or logo displayed in the address bar of the web browser.) This is another thing that helps make the website look more professional. Here is a tutorial by Marion if needed:
https://my.wealthyaffiliate.com/training/create-a-favicon-what-is-a-favicon/what-is-a-favicon
Personally, I used a free WordPress plugin called PhpSword Favicon Manager to make my own favicon. The process was pretty straight forward.
Now onto usability....