I don't know if I actually support your idea of storing all your userimages in your database(unless you know there are going to be few users with smaaaallll images) because this can slow down your application and make your DB very big...
If you're still going to do it this way , you would have to use som sort of BLOB-fieldtype(ex. MEDIUMBLOB or BLO😎 to store the images in your DB. Alternatively you could store the images on your server, and have a table in your DB with info about each user's picture....which is a solution I'm using on a couple of different web-applications with registred users