As shown by the query below, PageImages does not seem to find the image from the article's infobox.
{
"batchcomplete": "",
"query": {
"pages": {
"36621625": {
"pageid": 36621625,
"ns": 0,
"title": "Kristina Savitskaya"
}
}
}
}Another example: https://en.wikipedia.org/w/api.php?action=query&prop=pageimages&titles=McCrone%20Research%20Institute&pithumbsize=100
For comparison, here is what the JSON looks like when an image is found:
{
"batchcomplete": "",
"query": {
"pages": {
"160025": {
"pageid": 160025,
"ns": 0,
"title": "Star Trek planet classification",
"thumbnail": {
"source": "https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/The_Earth_seen_from_Apollo_17.jpg/100px-The_Earth_seen_from_Apollo_17.jpg",
"width": 100,
"height": 100
},
"pageimage": "The_Earth_seen_from_Apollo_17.jpg"
}
}
}
}Infobox images are always very relevant, and probably the best image to take from any given article. So PageImages should use them.