Puppy, our guardian dog

When the Guggenheim Museum of Bilbao was opened in 1997, one of the things that fascinated visitors the most was Puppy.
Puppy is a very, very big statue of a dog made of flowers with its own watering system. It was designed by Jeff Koons who tried to mix popular and elite cultures.
This little puppy was soon adopted by Bilbao citizens. It was supposed to stay up just for a few months but in the end the museum and the artist reached an agreement and Puppy will be forever greeting everybody who wants to visit the museum. Of course, if you don't want to visit you can see Puppy too, as he stands outside.
Twice a year the flowers are changed: in autum and hiver their colour is more dark, and in printemps and summer it looks much happier.
I don't know anyone who doesn't like it.

Puppy, our guardian dog

When the Guggenheim Museum of Bilbao was opened in 1997, one of the things that fascinated the most the visitants  the visitors most was Puppy.
Puppy is a very, very big statue of a dog made of flowers with its own watering system. It was designed by Jeff Koons who tried to mix popular and elite cultures.
This little puppy was soon adopted by Bilbao citizens. It was supposed to stay just for some months but at the end, the museum and the artist reached an agreement and Puppy will be forever greeting everybody who wants to visit the museum. Of course, if you don't want to visit it, you can see Puppy too, as he stands outside.
Twice a year the flowers are changed: in autum and hiver winter their colour is more darker, and in printemps spring and summer it looks much happier.
I don't know anyone who doesn't like it.

Nice and interesting essay. At your level though, you have to more careful about punctuation, in English, it's very important.