Divers are much more artistic than Artistic gymnasts.
… But are they are allowed to “cowboy” saltos on some skills. Leave a comment if you know the rules on that. (Perhaps we could get more specific on our gymnastics regulations.)
http://view.picapp.com//JavaScripts/OTIjs.js
UPDATE: From Mike:
D 8.5.2 During the flight, the position of the dive shall be at all times aesthetically pleasing. Should any of the positions not be shown as described below, each judge shall deduct ½ to 2 points, according to his opinion.
Tuck (C)
D 8.5.7 In the tuck position the body shall be compact, bent at the knees and hips with the knees and feet together. The hands shall be on the lower legs and the toes pointed.
It’s not specifically “allowed”. But is used as judges evaluate from the side.
(… I moved the other photo to the comments)
Gymnastics Coaching.com 