The tutorial Tato is there to give you something to photograph and quickly teach you how TOEM 2 works. That explains the tutorial case of TOEM 2 Tato not counting as critter: this Tato serves as a practice subject for learning photography.
Why is my Tato in normal photos?
If your issue is “My normal Tato didnt count as a Critter,” the reported case involved photographing Tato in the first area, then finding the picture among normal photos. The explanation applies specifically to the Tato inside the Tutorial level.
Check which Tato you photographed. The tutorial explanation does not establish how a Tato outside that level should count.
Does this explain the missing critter in my task?
The specific missing critter is not confirmed yet. The tutorial Tato's purpose explains that photo, but does not identify which critter the unfinished task needs. A way to return to the tutorial or make that photo count is not confirmed yet.
For help with other photo questions, see mouse camera controls, photographing the aquarium mollusc, or the Pondacondor Evolution Chart photo order. Use the complete walkthrough for broader progression help.