As long as you continued posting to LJ using our crossposter, another import will just magically fill in the comments from the LJ version of the post on the DW version of the post!
Sadly, we don't have an easy way to import images from LJ's Scrapbook: the API that LiveJournal provides and we use for importing doesn't include Scrapbook. There are various unofficial methods floating around for at least downloading your Scrapbook images to your computer to back them up; aside from that, yeah, sadly you'll have to do it manually. I'm sorry!
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Sadly, we don't have an easy way to import images from LJ's Scrapbook: the API that LiveJournal provides and we use for importing doesn't include Scrapbook. There are various unofficial methods floating around for at least downloading your Scrapbook images to your computer to back them up; aside from that, yeah, sadly you'll have to do it manually. I'm sorry!