I love this shot. It is just a snapshot with no real planning or technical expertise. Anyone could have taken this one with a small point and shoot camera.
Why does it work? It makes you smile. It is bright. The contrast of colors gives it a three dimensional quality. It is friendly. The subject of the photo fills the frame. There is not a lot of noisy background going on in this shot. It is simple. The fire hydrant, obviously an inanimate object, takes on a life of it's own once the eyes are added.
When you are carrying a camera, be on the lookout for simple things...little things. Keep them simple and fill your frame. Look for colors that complement and help things to stand out.
If you want to shoot this exact fire hydrant, head to Valpriaso, Chile. This place is a photographer's dream. This town has more bright paint and graffiti in it than the Sherwin Williams store in Harlem.