The thumbnail size adapts to the width of the screen. I don't understand the problem.

It's a matter of taste, I suppose. I prefer not to see a wall of images. but something tiny that I can click on if it piques my interest. I like the commentary of that image BTW. About par for the course. But I probably wouldn't stick around if there were a lot of them. And when we were working on desktop BG it would have been very annoying . . . too much scrolling . . .

If you use Stylish, you can try this:

ul.notes .note .note-body .note-text img {
    max-height: 150px;
}

Adjust the max-height to your taste. It won't provide a link to the image. I guess some javascript could be handy there.

EDIT: You can also use the:hoverselector to change the height toauto:

.note-text:hover img {
    max-height: auto;
}