Meine Soup

the easy ways (as in, no mucking around with html to pull images from several sources into one post):

1. post images as a quote
mark the images like you would a piece of text, post them via the bookmarklet as a quote. (the drawback here is that soup doesn't automatically correct the image size to fit in your layout [how to change the maximum image size for your soup] so parts of the images might get cut off. anything smaller than 450 pixel in width should be fine, i think.) you can edit out unwanted text etc in between images, too.
this option means all images in one post.

2. post several images as a gallery
in the bookmarklet, choose "image" for post type, then ctrl+click each of the images you want (deselect the preselected image if necessary). then proceed like you would with a normal image post. if you add a desription, it'll be added to each image when viewed.
this options actually means making several posts as one which will be shown in your soup like the first post here. (can't figure out how to link to a whole gallery post since each image is given its own post id, meaning each image in the gallery is a separate post.)