@ Turtle ... I couldn't stand it and re-did a new epub for testing... and you were exactly right, I forgot to link the CSS.
(That would explain why none of the methods in the links worked!)
Looked beautiful in Kindle Previewer for all Kindles they model. And in Sigil. (Am assuming this will work in epub too?)
... in your notes you said to set the CSS width to the actual pixel size of the pic. (Which I did for the test.) How does this spec work exactly? Like if that width in the CSS doesn't match the actual pixels of an image, what's the consequence?