Post text part 1Image 1Post text part 2Image 2Post text part 3Image 3Post text part 4Image description preambleDescription of image 1Description of image 2Description of image 3
Post text part 1Image 1Description of image 1Post text part 2Image 2Description of image 2Post text part 3Image 3Description of image 3Post text part 4Image description preamble
That'd be three separate and different descriptions per image. One in the alt-text. One redundant one under the image with no added value. And the long description