I understand how you feel and agree it can be frustrating trying to learn the skill.  I find pixel art to be very challenging personally, as I consider art in general to be unnatural for me.  It would be nice to have a personal tutor analyze and explain everything in a way you can understand.  But remember that their are so many talented artist on here that are capable of nitpicking every piece to perfection.  The time they spend looking at others art and critiquing is a essentially a favor.  Do not get discouraged by their advice but analyze the parts that you understand and can fix, and ask for clarification on parts you don't understand.  Do not expect every piece to be perfect, but the closest to perfect that your current skills can offer.  Then make the changes from critique in order to bring it closer to perfection.  Remember the reasons why you make changes in the critique and apply it to future pieces and through lots of practice you will get much better.  

Hope this helped, from perspective of a newbie artist.  I am definitely not one of the talented artists on here that I mentioned, but I do want to get better lol.

The arm is coming out of nowhere 

Well, here are my recommendations. 

First of all, if you know something is wrong, why not fix it? That's how you'll learn. 

If you know it looks wrong you logically know when it'll look right otherwise you wouldn't know when it looks wrong. 

Second of all, if you don't have a good understanding of anatomy (which you don't as you're beginning) you can't avoid using references. If you look at a real human face and compare to the face you drew, you'll realize a lot of things aren't the way you imagine them to be. The forehead comes to mind. 

Have high standards for yourself. Look carefully at pictures of people. Try to find one which has the same pose you're going for and take things from there.

Good luck and most importantly, plenty of practice!

Thanks for your critiques. I'd like to know how to fix some things, i can see how the ear is not the best of the world, of he face has not much volume, but that's not hard to spot in a noobie draw like mine, what's hard is to know how to fix it.

 The chest is pretty flat. The black outline is ok for the outside of the character but you could use contrast to make features stand out in the character itself. 

The perspective is flawed, the ear shouldn't look like this with that perspective. The perspectivef for the hair is also flawed.

There's no sense of volume in the face despite the shading.

The anatomy of the face is wrong. The forehead is too small for one thing. 

Pillow shading in the smoke, also smoke doesn't look solid like this, check a reference. 

Shading in the neck doesn't make sense.

The hand is "missing" in the sleeve. This is lost opportunity to practice drawing a hand. 

I hope this helps. Feel free to use the WIP forum to get more feedback to improve this. Good luck.

with a face you should start with a circle as well and grid it up .. you should look up examples of drawn faces and the gridding involved to get the face shapes right

It can be whoever you want, darling.

Is it John Cena?

Thanks, that was a good tip, i didn't think about it, just outlined as the rest. I'll take that into consideration in the future.

I dont know why

tip.. dont hard line smoke use a grey not a black .. i do it sometimes with black if i want a cartoon feel .. but if want to improve with smoke dont use black for the outline i am doing this now .just practising but i can see the differents in believability

I thought that was a sword :V