Your deltoids surround your shoulder and have three specific muscles: anterior delt, medial, and rear. To really shape your shoulders, you must hit all three of these areas. Try your alphabet T, U, V's to tone this area:
T raises (pictured here) hit your medial delt. Do 15 arm raises to the side and then hold the last one for 30 seconds. Lower and repeat the set.
U raises are a forward push extending the elbow overhead. Perform 40 overhead presses with light weights.
V raises are done on a bench lying face down. Start with hands together at the bottom in front of the bench and raise up to a wide position. Perform 15 repetitions and then hold the last one for 30 seconds. Lower then repeat the set.