You will get better. Of course, you will. Anything that you do a lot of you will get better. You must draw a lot! I always recommend to people to draw a ton, and not worry about the finished product. Be prepared to draw and throw away many pictures. You will have 9 failures for every success, at least at first. Speed up! Dont try to "carve" your picture, as if it were stone. Just feel the shape and line and lay those feelings down onto the paper. Quick!, like 1 minute. If it's wrong, start again.
As for drawing from the photo, especially in a difficult perspective such as you have chosen, try using tracing paper for a bit to help you learn how to translate the shapes you see in 3D into lines on a 2D piece of paper.
Do not compare yourself to others who have many more years experience.