It helps to use the puff fold triangles if you want a more rounded model: [video=youtube;Zbz0_y2XikM]http://www.youtube.com/watch?v=Zbz0_y2XikM"[/video] skip to 2:46. Thats how i make my triangles and they work very well too
It helps though lol Also I think people should take a look at this site http://3dorigamiart.com/ as it has a lot of really good origami and a good community