Convince the online retailers to do it! Or ask the manufacturers to put the info on their websites. However it is a big ask based on the sheer volume of information being sought. Both J. Stockard and Feather-Craft are pretty prominent leaders in the online fly tying market. They both produce some nice print catalogs. Both have long sections listing their hook offerings with pictures of the hook model and a description for each hook brand/model they sell. I did a quick calculation based on the 2023 J. Stockard catalog as to the scope of having a hook picture with measurements for each model/size of hook. Feather-Craft is similar.With the advent of online shopping I think there absolutely needs to be some standards. I won't try any new hooks until I can see them in person which is hard to do when the nearest fly shop is 30 miles up the interstate. @Northern's idea of a ruler in the picture and description would help.
319 Hook models from: J2 (19), Daiichi (49), Lighting Strike (2), Firehole (24), Core (24), Tiemco (32), Mustad (28), Gamakatsu (15), Hanak (12), Umpqua (12), Ahrex (69), Fulling Mill (13) and Partridge (12).
Average span of hook sizes available for each model = 7. Some models have more, some less.
= a potential of a requirement for 2200+ images in both print and online catalogs. That’s a lot of work $$$ to be created, proofed and updated for accuracy. It might be easy for big outfits like J. Stockard, but smaller online retailers—fly shops, etc. might find the cost overwhelming (although they won’t be handling the same volume of fly hook models).
So I’ll close with this question. Would any forum members find it useful for an online retailer like J. Stockard to add 2200+ images of hook models with dimensions for each model size to their print and online catalogs. Do you think they would agree with you?