Dont worry, he seems to be mean to everyone yet his own work itself is not that great.

Your model is not garbage, you have finished it and learned a lot, thats all that matters.

But just by looking at it I would say that you should focus more on the bottoms of the legs look too skinny and from the elbows down on the arms look too skinny. The tip of the chin is too skinny and the mandibles seem too wide.

In the future you should try to do more with less polys, if you want a true critic post your wireframe here and we can see how to lower your poly count.

Also the normal map and clothing look very strange, you should stick closer to your references.

But dont throw away your model, your basic rule should be:

"Would I use this model in my own game?" If you answer that question as yes then maybe someone else would want it for their game, and there is a chance you could sell it. I have seen games that might buy your model.