Ugliest thing I've ever seen

Wow, so ugly. It appeared on my blog for less than 3 minutes before I deleted it. Photographs all different sizes, description covering most of photographs. Just ugly.

Hello,
Did you follow the instruction about installing Regenerate Thumbnail plugin? Your issue about “photographs all different sizes” is related to thumbnail size. This plugin as mentioned in the description uses custom thumbnail size, you have to use Regenerate Thumbnail to regenerate thumbnail for your featured images.
If you are still interested, you can install it again and see how it looks after you regenerated the thumbnails.