1.See is the ordinary word to say something 'comes to our eyes.'
Suddenly I saw something strange.
See is not used in progressive tenses with this meaning.When we want to say that we see something at the moment of speaking, we often use can see.
I can see an airplane.
2.We use look(at) to talk about concentrating, paying attention,and trying to see as well as possible.
I looked at the photo, but I didn't see anybody I knew.
We use look when there is no object, and look at before an object.
Look ! Look at me !
3.Watch is like look at, but suggests that somethig is happening or going to happen. We watch things that change, move or develop.
I usually watch football matches.
4.We watch TV, but we see plays and films.
Have you seen any of the Chaplin films?