Wow, I like to see your progress! I love drawing, which is the most interesting hobby ever. Moreover, it calms me down very well. I feel like I'm in another world when drawing. I think you lack some space perspective (like feeling the object's volume and showing it with the help of the right construction, shades, and lights). However, I think you'll manage to reach perfection in it! You have to move here and work a lot. You can also get creative ideas and tips from here photolamus.com, which helped me a lot to start drawing.