spojrzenie, difference from words like ogladać, obserwować.
I think spojrzenie, spojrzeć is a one-time act, while 'oglądać', 'obserwować' is a sort of a continuous process whose duration is unspecified, though.
What's the difference between oglądać i obserwować. Try to work it out yourself while reading your book.
And here arrives Lyzko with 'patrzeć', yet another verb of the kind! Maybe the usage of the three of them is a matter of connotations. Let's take 'television':
Oglądam telewizję. [This one is OK.]
Obserwuję telewizję [This one is stupid.]
Patrzę na telewizję [This one is less stupid than the previous one, but very unusual and not 'normal', yet I once met a native speaker when I was in a sanatorium who frequently used to express himself like that: Idziesz patrzeć na telewizję? I always got annoyed and was always refusing his invitation to watch TV!]