If you're looking online for illustrations for your family history there are plenty of places to go. I start with Flickr, Google Images or a library or archives web site local to the place of interest.
I was surprised to find a web site providing free and open access to over 520,000 images digitized from primary sources and printed rarities in the collections of The New York Public Library. From the NYPL you'd expect items to be well catalogued, and they are. There are historic images of Ottawa and even the coat of arms of my home town of Great Yarmouth in Norfolk from a cigarette card.
Looking to illustrate an event in a particular war, other event or year? Search here, although as I found when searching 1812, you may not agree with the description of who is described as a hero or the victor.