Hi! What’s great about your tiger is that you can recognize it by its physical features. For the angry, you can tell by its lowered ears, open mouth, and pupils surrounded by white. I looked for reference photos to help me with my drawing. What I emphasized the most was the area around the snout and above the eyebrows, where everything tends to furrow, just like you angry. If you can add some wrinkles around the snout, that would be great. I also emphasized the black lip around their mouths, it almost looks like they're drooling a little. And the last one, make sure the wiskers point upward. I hope this helps!