The proportions seem way off. The immediate things that catch my attention (in the wrong way) are: the wrists are as big as the legs, the neck is tiny, the hands are bigger than the heads, the torso makes this creature appear really short, even though the muscles and clubs imply it is large. The green color matches nicely and the caveman style clothing fits the character. If this creature is supposed to be scary, the facial expressions make me not want to take it seriously.

I like it but I think there could be some more color variation. The character is green. It's clubs are both brown. It's clothing is brown. The hair is brown on both heads. I like the mouth distinction between the two heads, but I feel like there could be more color variation.

The texture of the skin seems a little rough. The torso could be made slightly longer to make it more proportional. It looks like it could easily be a monster design from Dungeons and Dragons from the 80s, which could be a good or bad thing depending on the overall style you are going for. I would need more information on what this is from to make a better judgement.