Aah, isn't it the cutest possible position in which you can see Miss Viper? ^u^
Master Viper is taking some sleep with Po and Furious Five while journey to Gongmen City. She coils around herself and uses her own body as a pillow. Almost like a cat. Unfortunately, there is a little screenshots in high resolution containing Master Viper...
Picture has been brightened. Screenshot took from Disneyscreencaps.com
All credits goes to Dreamworks.