Seated position, reserved for Great Buddhas, sometimes with crossed ankles, feet on ground or stool.
Kisazo, kneeling posture, praying, devotional images, South- East Asia, JAPAN.
Rajalilasana King's posture, expresses ease and relaxed confidence. 
Crossed ankle position symbolic of royalty. Sitting at ease position, left leg raised, right foot touching ground.
Left foot on right thigh, position used on most sitting Buddhas.
Buddha images are often based om proportional grids. This grid plots the seven Chakra energy centers
Right foot over left thigh, less common, used by some esoteric Buddhist sects