Have you ever been to Shibuya? It's the fashion capital of Tokyo. A statue of a dog called Hachiko is waiting in front of the JR exit (Yamanote Line). Many tourist take pictures there and then cross the Shibuya crossway. At this place, sometimes you will be asked for interviews. The career of many models started in this location.
Of enjoying free art in Shibuya, you need to use a different train exit. The Hikarie Department is located near the exit of the subway lines (Fukutoshin Line or Tokyo Toyoko Line). You find galleries at the 8 floor of the Hikarie Department. The artist will change every week, so there is always a chance to see great work.
If you are interested in showing your own work, please let me know and I can share more detailed information with you.
Address 2 Chome-21-1 Shibuya, Shibuya-ku, Tōkyō-to 150-8510
Station 1 min. on foot from Shibuya Station