What’s the difference between look (at), watch and see?

All these verbs are related to sight and vision

1. See is the most common of the three verbs and is usually followed by an OBJECT:
   They’ve seen MANY PEOPLE wearing hats.
   John saw ANDREA at the party.
   But it doesn’t always have an OBJECT:
   I can’t see well, so I need to wear glasses.
   See (meaning vision – there are other meanings of see) doesn’t usually take the progressive form, but look (at) can:
   We’ve been looking at churches all day!
   We’ve been seeing churches all day!
2. Watch is used when animals or people look at something (or something happening) over a period of time:
   I’ve been watching the cricket, what have you been doing?
   Last night we watched a film.
3. Look (at) means ‘using eyes for a particular reason.’
   “I want you to look straight into my eyes.”
   He wasn’t looking where he was going.
   Look also refers to appearance when what you are looking at is the SUBJECT:
   SHE looks great in that red dress.
   THE HOUSE has been looking awful for the last few months.

So in summary I’d say that see is the most common option while look (at) and watch are both similar to each other, except that watch is used when describing actions that take place over a longer period of time.

look-see-watch.