Hey there! Lovely theme! :D The reason why they look "boring" is that all of them have the same body type; there's no clear archetype in your characters. First and foremost, define the attitude of each one, and that will you define how they're posing. For example, the first one. She seems like she's kind of suspicious. Then, maybe she's holding the scroll in both hands and looking to the other side to see if no one is coming? If she's the bad one, then some triangles would help to push the design. The lumberjack is a strong character because of what he does. Then, using more square shapes with a "heroic" pose would help to communicate his attitude. Like: Hey! I feel proud of what I do. Sort of lol Form language will help you to push the difference between each one. Either with the body proportions and the clothing, props, etc. The other aspect is the storytelling. For example, the archer. What if he's blind in one eye? That makes you think that something happened before. Hope this helps!
