The best images will come from Infinity War. So until then, if you have enough information about them (role and history) I'd say go ahead and create the article, but categorize it as imageless until the pictures are uploaded.
Because they're cropped images, which someone decided to do instead of waiting for a textless edit. Textless images of character posters are what's used, typically, for the articles. Cropped images just mean you're subtracting from the quality