Nice start, and thanks 4 the sweet perspective tut links.
So for some critiques, the brush stroke calligraphic practice, I'd say its a waist of time. The very act of drawing will strengthen your calligraphy. And maybe later on, practicing cursive or something may help you. But for now, Id say dont spend your precious time on that.
Also, I see a lack of drawings done from either live figures or figures in photos. Imo, you should do LOTS and LOTS and LOTS of figure gestures, and figure drawings. From life or photo. Keep it up!