I like the fun poses you tried, there's a cool gesture to the lemur curling up its tail. I think there's still room for experimentation/stylization with the face, which can help achieve the result you want. It seems you nicely broke it down into the simplified pentagon face they have, plus muzzle, eyes, and ears. With just these elements, you could change the proportions to see how you can achieve something innocent, like huge eyes and a small muzzle, or change the expression towards something sneaky, like side eyeing or pushing back the ears. Try a couple different variations, just keeping it to simple shapes with no shading, and see what you think works best.