Perspective is difficult when looking at glaciers, especially pictures of glaciers.
The 'cliffs' you see are around 300-400 feet high, or three times as high as the cruise ship.
We are four miles from the glacier here.

Same photo from further out.

And further...

Harvard  glacier.

Another glacier in College Fjord.

Cruisers enjoying College Fjord.

Again, perspective is an issue. 
The tiny clump in the middle (1cm in this photo) is about 500 feet high and three miles away.

A river of ice.

We could not have asked for better weather while sailing College Fjord.