Arrows

Starting with your arrows, you've mostly done a good job, though they've some issues.

Firstly, the lines are a little bit wobbly. Like in lesson 1 exercises, you should always be prioritizing confidence over accuracy, and make sure you ghost every line as well.

This applies to hatching as well, take your time with it and don't rush it.

Second issue is that the arrows themselves aren't growing much as they get closer towards the viewer, check this

And lastly, remember you can add lineweight to overlaps to clarify the folds. This should be done with confident ghosted superimposed lines too.

Organic forms

About organic forms, you start doing well, but end up going away from the basic forms you should be going for. Don't forget as well to draw axis lines for the contoured sausages as well.

Lines are pretty confident with the only exception of some ellipses, so good job on that! As a last thing, you're having trouble in the shifting of the degrees of the sausages. Even if the sausage is completely straight there will still be a shifting in the degrees of the ellipses. Take a look at this as it might clarify it a bit better.

Textures

In textures you're doing a pretty good job overall; the main issue you seem to have is that sometimes you tend to focus on outlining forms. Remember that you can only draw cast shadows of forms, you can't outline the forms themselves.

Form intersections

In form intersections you're doing mostly a good job on mantaining consistent foreshoretening in the forms, though you seem to miss some of them. Something that helps to improve this is to draw every form with shallow foreshortening, which is way easier to make consistent over every form.

Another thing is that here as well you seem to be rushing the hatching a bit; remember, take your time with each line and place the pen carefully at its start so there is no fraying on both ends.

Organic intersections

Organic intersections in general feels pretty solid and 3d, I can only catch that you're not drawing through your forms. Don't forget to always draw through them even if the viewer can see them.

Shadows run believable over the surfaces they're being casted, and you're mantaining here basic sausage shapes as you should be doing. They also hang believable over the other sausage, so good job on that too!

I'm only going to ask you to do 2 pages of organic forms. One with contours and other with ellipses, to make sure you understood my pointers. Keep it up!