Do colour changes indicate changes in health?

[Ducksarefun]

I just recently purchased a crested gecko, fire morph. I have read that colour changes indicate changes in mood, but can anyone tell me what indicates what? When I picked him up he was light tan colour, but this morning he has changed to a darker redish orange colouration. Does this mean he is adapting well to his surroundings? or does this mean he is stressed? He seems to be acting normally. the temp is between 70 and 80 and the humidity is just over 70, I know the humidity is not really high enough but I attribute it to the tank being new and the soil is a little dry. I have been spraying it regularly to moisten up the soil ect.

does everything seem fine? or is his colour change showing he is stressed?

thnx!!