Okay, first of all, let me get this out of the way: as much as I've enjoyed my time on NG so far, a lot of the foundational works aren't exactly... "my type of 2000's edge," so to speak. No disrespect to all the work that went into them, I'm just saying this as a disclaimer, that if I get anything obvious wrong, I'm not all that familiar with "the lore."
Okay with that out of the way, distinctive design. I can tell you want to keep it fairly naturalistic and not go overboard on details, so what I'd recommend working on most is actually stance and composure. Assuming the main sketch is a fairly standard rest position, there's nothing all that threatening going on from the shoulders down. Having such a bulbous head would probably give the penilian a bit of a... droopy posture... so maybe it could have a bit more of a zombie-like silhouette. Hunched over while standing or walking, arms hanging in exhaustion, when running it moves fast but kind of flops arou-
Speaking of the taxonomical elephant in the room, if you're going to have a creature called a "Hyper-Evolved Penilian," it'd make sense for a few of the features - like the back of the head, and the fingers - to be slightly mushroom-shaped. That's all I'll say on that matter, do with it as you please.