What is this in english 良い午後 mis 美しい?

This is not really anything in English, or Japanese, besides a collection of fragmented Words. 良い [ii] is "good." 午後 [gogo] is "afternoon," but 'ii gogo' would not be "Good afternoon" in the sense of a greeting. It would be more likely used in a phrase like 'kimochi no ii gogo.'

I don't know what "mis" is meant to be.

美しい is "beautiful."