... I'm somewhat afraid to say it ... but yes, I am. I also make a living drawing things.
I recommend trying to imitate a certain style you like, and see how whatever the artist you chose went about representing the object he or she chose to depict.
then look for some other style/ artist and see how he or she chose to draw the same thing.
also really good is using some evryday thing, like an apple, and drawing it a few times, then switch tools, i.e., start with pencil, then coloured pencil, then watercolour, then ink pen. draw a few of each.
see what you can do with each different tool. try different styles with the same tool. - but try it always with te same object, so you learn about tool use.
also, drawing with closed eyes is really good, or drawing upside down (your drawing - everything else right side up)
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I can read facial expressions. I did the test.