I love it when they say that.

I wanted to point out the fact that while his eyes are detailed and well-drawn, his right one (his right, not the viewer's) is slightly too large and his left eye is a bit too small. Generally, if something is further away, it will appear smaller (and vice versa).

Also, the eyes are spaced further apart than they should be (ideally, when viewing the human face head-on, the eyes should be the width of one eye apart). It's probably his left eye that looks too far from the other one.

The last thing is how high/far back the part of his hair is.

The good news is that all of these are slight things and they fall under the same category: spacing. If you were to use a grid at the very beginning for position and proportion... well, I'd really like to see the result, given your obvious ability/enthusiasm.

In short, keep up the great work. I hope this helped a little.

--
They say I turn innocence to panic
but I don't care.