Before I say anything , I have to let you know that I can really see you as a very good artist, you have pretty good techniques and I absolutely love your "Items" section of art, also looking through your list I saw you really gaining experience and becoming better and better with every piece.
Now, I consider myself as an experienced artist, so I think I have my rights to give you an advice (if I can even say so
).
First of all, although you said you don't draw full time, I think It's still nice to practice. And for you it's especially good for you to practice faces people in general.
Secondly, sometimes it's nice to copy some other artists' styles. (Note that I'm not saying that contouring is a good thing.)
And thirdly, try new things! You never know what kind of new way to draw this and that you will find. Your style is nice, but sticking to one at this early stage can cause a lot of difficulties on your way to perfection