Remove the clutter! In case you can’t get a lot of the makeup and shaving cream below the sink, (and who can?) pick up several baskets from the dollar shop and corral them in. Make sure there’s a hinder. If you’re short on space, utilize the kind that hangs around the back from the door. A large drawstring bag is acceptable for this also. (He could actually make use of it… Ok, it’s objective.)
Dress up that large frameless mirror. Hang swags of material from cup hooks to hide and make softer the edges of the mirror, and to provide a “frame”. Or actually, use cut lengths of 1×4 lumber, and connect them to the wall above the edges of the mirror to simulate a real wood frame. You are able to stain or paint them as well to organize with your cabinets.
Talking about cabinets, how about providing them with a simple remodel? Paint them black for a sophisticated look, or white with sponge painting to have a country theme. Try some of the hot faux finishes. You are able to paint the Formica counters. Just clean well and apply a special primer first like BIN or KILZ. Then seal with 4-6 coats of polyurethane following the paint dries out. Should last for years!