Store a picture in a cookie

Question

I would like to store a small profile picture of my users in their browser so that they can see their profile picture (in the login form) each time they log in (when they tick r

Answer 1

Surely it's more efficent to store a link to an online image in the cookie, and use that instead?

Each time a webpage is browsed, the cookies get transmitted - storing an image will add unecessary bandwidth.