"Pied Beauty" is a celebration of natural creation bookended by traditional religious expressions of praise and glorification. We have trouble deciding whether the poem is meant to be a private and personal prayer (it was never published in Hopkins's lifetime), or if the speaker is addressing an imagined audience. The poem was written in 1877, the same year that Hopkins was ordained as a Jesuit priest by one of his heroes, the famous English writer and theologian John Henry Newman. "Pied Beauty" comes near the height of Hopkins's religious fervor.
In "Pied Beauty," the sounds of words are supposed to convince the reader of the beauty of the things they represent.
When the speaker says, "Praise Him" in the final line, he is talking to himself.