Like a giddy lover, The Eyes of Orson Welles only has eyes for Orson Welles. Mark Cousins’ latest cinematic essay is a swooning, engaged, delightful dive into Welles’ career and personal life and, in particular, his practice of looking, his visual vocabulary as expressed in mostly-lost drawings and, of course, the construction of those fabulous frames. If the film is also under-edited and at times over-earnest, then this can be forgiven. Anyone who’s ever penned a love letter knows how easily they can get away from you. The Eyes opens with a sealed box, a mystery like Rosebud, retrieved from…