Attach larger pictures to the profil

As part of the profil, it is possible to save a picture. The size of the picture is limited to 48x48 pixels. To realy be able to recognize someone, the size of the picture must be larger. Why isn't it possible to store as well a larger picture, which could only be displayed within the profil or even better in the list of the people. Otherwise the pictures are only helpfull, if you allready know the person. To check or search about the name of a person only by the picture the small picture is NOT helpfull / usable.