As for Prendergast, some biographical information can be found here and here.
Being a committed broken-color guy, he usually painted outdoor scenes, though not many still lifes. Interestingly, he often included small, full-length human figures in his landscape works, usually with many such figures in a single painting.
Another genre he tended to avoid was portraiture. That's not surprising because painters using broken-color or small-areas-of-flat-color styles as Prendergast did, probably found that such styles weren't compatible with portraiture. Nevertheless, he did paint a few portraits in the years immediately after he moved to New York City. I located three such images on the internet, and here they are:
Like many American Impressionists, Prendergast retained a certain amount of delineation and structure in his paintings. This is particularly noticeable in the portraits shown above, because if an artist's intent when making a portrait is to actually portray, then the Impressionistic approach has to be dialed back, as they say.
The images above strike me as being satisfactory Impressionist style portraits, but not very satisfactory from the standpoint of pure portraiture.