You have done great job, but dont be so lazy because you wont become better, you will only become better if you aim for perfection, even if its impossible, if you stay lazy than you will never get better, you need to work real hard and critique is very good thing, you shouldnt take it personally people just express their opinion, they want to help you so you repair flaws wich you couldnt see or give suggestions how to make it better, I know that it may sometimes be demotivating and demoralizing and sometimes a small sentence as its good can motivate you back to work...you are doing great, but put more effort to it.
For some critique, it looks good but shading on his forehead is kinda strange, plus his cheekbone has almost no shading and you could try to make his hair more defined.
Otherwise good job.