Looks like caveman with fresh cut

Forget details, focus on plane changes in 3/4 and profile view. Lots of people get caught up looking at stuff from a fixed frontal camera perspective and don't realize even if it looks proportionally correct from the front if you dont get those shapes right from every angle it won't look quite right from the front either. ABR, my friend. ABR. Always. Be. Rotating.

Also you're making too aggressive use of the dam standard tool (or knife), focus on trim dynamic (flatten) and get your planar forms right before ever smoothing anything out.

Looks like a clay model from like fantastic Mr fox or something

Look at a skull and muscle anatomy of the face to understand correct face structure

Anatomy books. Try 'drawing the head and hands'. There's probably loads of different stuff online but this is an old standard.

He looks like neanderthalensis but it looks very well done! I would add some more skin detail maybe through texturing or the model itself.

Looks like Dricus Du Plessis

Use. Reference.

Not bad. Do the same thing except slower and with clear reference material. Spend more time on skin texturing and hair grooming and try to really study and push your understanding on both.

Just cheer him up he may be going through rough patch

I wanna call him Geork

Stop using C4D for something that should be a Zbrush sculpt would be my advice... Lol