2.1how does the speaker describe his beloved in the third stanza,and what do these descriptions reveal about her
The persona describes her lover as, "my subtle-fingered humorous one" meaning a souvenir, something of value, good looking, delicate and pleasantly complex. she was of value to her.
further, "stepping back a moment from your easel," as he describes means she is her piece of art that holds him while he becomes who he is. It shows how much he treasures her.