your contour curves are not curving around the form. remember you can hook them around for better results. also, your sausage forms are to rounded.

i cant understand your organic intersections. use line weight to reinforce which forms are on top of each other,

i cant understand your intersection. use line weight to help clarify your intersections.

your arrows look ok, i would add shading like you in the videos and try to add foreshortening.