Thanks for the nice message. I appreciate your kind words. You are very generous in your estimation of my work, thank you.
The first thing that stands out to me in your SB is the love of art and the total enjoyment you get out of creating a piece. I can feel the sense of fulfillment in your finished work. That is a quality I miss at times, because of my habit of immersing in lotsa studies but no endeavors towards completed works.
I can see you've studied quite a bit on achieving your painting style. The textures on the stones and pillars you achieve are quite nice.
Because the main subjects of your work are humans, I'm curious. Are you doing live figure work at this time?
I think just memorizing proportions and getting a mannequin type of initial construction set-up in your figure sketches will go a long way in solidifying your figures. Sometimes it's not about knowing what muscle goes where, but can be a matter of one section of the body being clearly distinct but still integrating with the next section. ex. The torso is a distinct section that sits on the distinct shape of the pelvis. In construction, I try to draw the 2 as separate pieces to the body. How they integrate is in the torsos abdomen wedging down into the pelvis and the pelvic hip bones coming up to meet the torso at the sides. You must be able to show where the under-structure support is even if you can't see the bones, because that framework will always be felt or missed. This framework is what you rotate or twist in movement. The muscles simply sit on and are influenced by the angles of these structures. This is what people will notice about any figure drawings. I am recently focusing on this very thing in my own studies. Small details that make a tremendous difference.
Check this site out. http://fineart.sk/index.php?cat=1
Click on Figure Drawing for all it's Worth by Andrew Loomis. This book is the standard bible for illustrators needing understanding of figure construction. Drawing the Head and Hands is THE most valuable reference ever for human head drawing. I poured over these books as a kid and again in college.
With abit of study your imagination will be supported by solid forms and your vision will be that much more powerful.
Keep up the great job!