Is it use or usage here?

[Art]

They are usually interchangeable. As a rule of thumb, if either “use” or “usage” seems appropriate, go with “use.” THIS is one of the exceptions:
1.n) accepted or habitual practice
2.(n) the act of using
3.(n) the customary manner in which a language (or a form of a language) is spoken or written
As you can see, exception three applies above, so "usage" is correct.