>>4889926I happen to be an expert on this subject
>>4889942I have this book, it's on libgen, but it's missing a LOT so watch out
Sargent's drawings are basically spread out all over the world in different museums with some having been sold in auctions and shit, you're lucky to find a copy online and even then it almost always is fucked in some way by digital processing or has shitty low res, look at his drawing of then-princess Elizabeth, it's absolutely blasted on the preview online but if you go to the actual museum they offer books with copies and shit, your best bet would be to find these reproduction books offered by museums and have them scanned to use alongside
>>4889942, but even then you wont find good images for the ones in private collections but maybe check out auction sites.