Node makes scraping images off the web extremely easy using a couple handy packages: Xray and Download. Simple scrape the img tag, grab all the src attributes, filter out images you don't want, then hand them over to Download to grab them.
When web scraping, you'll often want to get more than just one page of data. Xray supports pagination by finding the "next" or "more" button on each page and cycling through each new page until it can no longer find that link. This lesson demonstrates how to paginate as well as more advanced selectors for when links are difficult to scrape.