well..usually this kind of frogs are living in the trees...I've never seen on of these frogs getting dirty....they are wet all the time, so that dust and mud can't stick on the body that good. If it's raining it just has a higher specularity......Kurt is on the right track in my opinion. Maybe he should also add some specular highlights on his goggles...just to show that there's some glass there (if there should be any glass). And for a more realistic look, you should think about using DOF (I'm a huge DOF-Fan -> for me that's instant reality..because this kind of photography is a macro shot, because a frog isn't that big) just some suggestions.I would just add some dirt on frog becouse if its raining there must be mud and frog must get dirti