volosity, the bottom picture contradicts your theory, (and its a bad selection of anatomy pictures you've chosen to use) look at the arm on the right of that picture. Or alternatively you could stand infront of a mirror with ur palm parallel to the ground and see what kind of view there is of the bicep, you should see part of your tricep from that posistion too, and then see what its like with your palm facing infront of you. The bicep will face the mirror when your palm points towards it.