It's looks good m8.

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                                       jk

Organic Arrows:

+Lines are a bit wobbly

+Make to to use line weight to clarify overlapping lines for all your arrows.

Organic Forms:

+Overall looks good,all i'll add is you should only draw through your ellipses two times.

+I noticed some of your contour lines have little mark sticking out of them,if this is to perform a clean up pass then make sure you never do it again.All lines should be drawn with confident using the ghosting method.

Textures:

+Cheers for completing this one :)

+Looking at your work,it seems like you're outlining and enclosing the forms,since texture are made out of forms and their impact are the shadows they cast,you should rlly be drawing the shadow instead.

Dissections:

+While you have make an effort to break the silhouette on some of your sausages,you should try to apply to all of it so you can get the most out of this exercises

+While this isnt a mistake.try working implicit,you dont need to add every details onto your pages,pick just enough and let the viewer brain fill in the rest,it'll also make your drawing cleaner and comfortable to look at.

Form intersections:

+Try to keep your foreshortening consistent so to avoid adding unnecessary difficulty.

Organic interesections:

+looks like you understand how the form relate to one another in 3d space.

+Try to use lines weight to clarify overlapping lines like in the arrows exercises

+Some of your cast shadows has bits of your pen tip sticking of it ( sorry if this is nitpicking :) but you could draw the outline of the shadow first and then fill it in afterwards.