Hi there,
nice work you cleary have a solid understanding of animation.

A few hits and tips.

The shark scene was great, very finished look. However maybe also slip in swim cycles from side/ top angles to show the animation more clearly, though definitely keep in the cinematic shots.

With the cave man, he moved well but the weight of the club felt too light at times. If you where holding somthing that heavy, the balance would be way off, but well animated regardless.

The final two pieces where nice! The overlap was over the top at times and the weight seemed verly slightly inconsistant occasionly.

Apart from that some of the moving holds felt a little awquard.

Overall, very nice reel.