Thanks for Your kind comments: Anatoly15, Dalth500, Nomad and Lilia :)
I carry my tripod only on special occasion and I take my camera with me all times when I leave home. Shutter speed of 1/60 doesn't legitimate to use a tripod with focal length of 55mm but some people teach us that it helps to compose better. I don't follow their guidelines for using tripods.
(to summarize, I didn't use tripod to take this photo).