The inverted pyramid is almost always the correct format for your text. I often put the tweet-length version of the post in the title or first paragraph. Get to the point quickly, then elaborate. Means you can bail out at any point of the text and still take home most of what mattered, while the meticulous crowd can have their nitpicks addressed toward the end.
The problem of finding an audience is best solved by being really transparent about what you're about. Inverted pyramid solves that. There's no point to drawing in people who aren't going to be interested. Retaining existing readers beats capturing new readers.
I'm less bullish on images, unless they are profoundly relevant to the text. Illustrations for the sake of having illustrations are no bueno in my opinion. You want to reduce distractions and visual noise. Images should above all never be funny.