So I’m not doing the Blogging 101 Lessons in order (I was like this in school, if Hamlet was assigned I read King Lear. Not particularly admirable, but at least I did read Lear).
This assignment is “love your theme” with the advice to try at least three different themes. “Even if you’re happy with the one you first chose. Try one you’re drawn to, and one you would never use.”
As I have blogged before, trying out themes is something that I do a lot–in fact it’s a problem. (See https://afewreasonablewords.com/2015/06/14/words-of-advice-the-tragedy-of-theme-addiction/)

What’s more I’m very happy with 2015 (one of the standard WordPress themes) when it comes to my personal blog. I don’t do anything particularly tricked out in terms of features, widgets, doodads, and the like, so haven’t encountered anything it can’t cope with and it’s responsive and works well with my signature image (a blue sky over Monhegan, ME).
But in the spirit of trying of doing the homework as assigned for once, I checked out two different ones; here they are and what I learned:

Here’s Cyanotype, love the color and type, and how the photos pop. Not sure if the antique photography inspiration works visually or editorially with my content. Seems a little too spare. (This is the one I chose because it appealed to me).
And then there’s Patch, which I chose because it was one I would never use. It’s all “cards” (how is that still an Internet design thing, aren’t we on to the next idea?) But I will grant that 1) this kind of approach dissolves the distinction between content for mobile and content for desktop sizes (by making it mobile first, not a bad idea). 2) It pointed out to me that featured images and tagging are as important as what you post.

A useful exercise, but I’ll stick with my current rig.
I like how you posted pics of all the different themes you tried and commentary.