Pear drawing with pear 2: Still have some slight difficulty in differentiating the shades with an HB pencil. Anywhere else I can improve?

Hi everyone. I have been following Proko for a whole while now, I think 2+ years, and gushed over all the courses, never thought I could manage or take on any of the courses until this one came along but one small hurdle came along, I can't quite seem to get a schedule going. I am a beginner when it comes to drawing (well yeah, the course haha), is there any advice any Pro or anyone at all would be able to give me to be able to start on a schedule and be able to keep up with it? I searched countless YouTube videos and I cant quite seem to grasp a good method. Any help at all is appreciated. Thank you so much in advance.