How do you know that your author photo/headshot on your website is the right size/ downloadable-ness to make it easier for people who need it? I know to not name it “author headshot” because then the person who needs it won’t be able to know who’s it is, but other than just uploading a jpeg picture that looks fine on my computer, I’m not sure what else I can do to be helpful to the people who ask for it
I am by far not an expert but! It’s my understanding that the ideal size is between 1,500-2,500 pixels wide, and 72 dpi is perfect for social media uses, websites, and most “normal” online and small-print uses. This has always been totally sufficient in my experience.
The thing to remember is, it’s super easy to make a large image smaller. But it’s not so easy to make a small image larger -- if you try and enlarge a thumbnail size image, it will probably end up blurry/pixelated/ugly. But if you have a great large headshot, it can easily be shrunk down to any size.
Here’s a real-world example; my author Gwenda Bond. Note that she has a page on her website that is specifically a Press Kit. (That’s really helpful!) -- Anyone who is writing an article about her or one of her books, or planning an event with her, or whatever else, can easily access good images of her and all her books, her bio, and book info for each title. And the images are not huge on her website, but large versions are downloadable easily. http://www.gwendabond.com/about/presskit
As for what to name it -- I’d call it “Author Name_photo credit: photographer name” -- because publications like PW always want to credit the photographer, and if the image is passing from person to person, and the photographer isn’t credited on the image, it’s easy to forget who they were! So Gwenda’s image here, I’d call something like “Gwenda Bond headshot_photo credit: Christopher Rowe”.
You would probably (????) need higher resolution if the image were going to be printed on the cover of a magazine, or like, large banners or something like that! But I would imagine that anyone who needs a super-high-res or especially large image will know how to ask for that or help create it. I, for one, have never been asked to provide such a thing. And now I am tapped out of info -- if you need more, find an “ask the professional photographer”!