Minh - I really like your introduction, and I see progress in your work. This site is a great reference; don't forget to check out the portfolios of artists represented here. There's a huge range of styles and levels of accomplishment, and I learn something different from them every time I view them. I also enjoy seeing other artists who post for critiques; you can follow their growth and it's inspirational.
You can go far with instructional videos, books, and most important, logging in the miles and miles of canvas.
I find that I have to be very responsible for my own learning. I've got a workshop coming up with Allan Banks (atelier-trained classical realist, you can see his portfolio
here) and to prepare myself, I'm really working on drawing portraits in charcoal from casts and statues, to train my eye to see simple values and planes of the head.
Best of luck with your journey and I hope to see you here often.
As an aside, have you tried triathlon? You seem like a multitasker.