Thanks

@YarisSedan the standard and recommended size is 1920, based on what is your photo resuliton. If it's 1080 then go with 1080

@MrPigee np, and now you know i guess

@YarisSedan Danke!

did you know you can increase the quality of gravatar images? because you can actually do that believe it or not by increasing the numbers at the end of the image url, it's something like this
https://2.gravatar.com/userimage/257611110/b7b9d80214026308a6d657b4c9819646?size=256
to
https://2.gravatar.com/userimage/257611110/b7b9d80214026308a6d657b4c9819646?size=9000