Q: How do I import product pictures?
A: The pictures filename path must be relative to the host file system; not your local PC/browser.
On the admin>products page, select one product that has a picture, and then do an "Export to Excel (selected)". Look at the Excel sheet. Note the host path for the picture. You will need to prefix your filenames with that path when creating the CSV file. Don't use the exact path. You need to create a temp folder up a level or two, and put your files in that temp folder. If hosted, you will need to FTP the image files prior to import.