please help me with the colour of my senegal chameleon???

[rootsrockreggaehorse]

her whole body is a nice light green like it should be but sometimes half her head goes a browny colour, not dark just a light brown and sometimes half her body and its not when sheis basking because its when shes out of the cage and sometimes wen she is just roaming around!... can any1 tell me if thats normal??
cheers

 

[kinyonga]

Front half of the body and back half are different colors or left side and right side are different?