If you are going that far out of your way for scenery you might as well stay on US 84 toward Espanola instead of using 64. You will drive through the "Georga O'Keefe" country between Chama and Espanola. Then follow the west bank of the Rio Grande up on NM 74 and 291 to NM 68 and Taos.
Also using US 50 from Pueblo to Salida and US 285 down to CO 112 over to US 160 is more scenic than I-25 from Colo Spr to Walsenburg. Although La Veta is a nice pass, crossing the Alamosa basin on 160 is flat, dry, high desert from horizon to horizon, with some irrigation farming.