Hmmmm.... good point. Maybe I can add burn marks on it, and with the pose it's in, it could be like it's ready to endure more hits from an unknown enemy? Showing that it has taken a lot of pain, and is still ready to defend!
EDIT: Here's a new and improved version of skarm.
Look's like skarm's taken quite a beating. But he just won't stay down. And look! Rocks. But whose stealth rocks are those? His..... or the enemies?