ARROWS

Your arrows look good. You got pretty confident lines, the only suggestion would be for you to try some more "extreme" perspective distortions with your arrows coming from far away and getting closer. But overall it looks great.

ORGANIC FORMS

The sausages look mostly good, but you got wobbly ellipses. Remember that for these exercises is more important to get confident lines and ellipses than wobbly ones. Even if the wobbly ellipses are very accurate, stay with the ellipses with confident smooth and even flow. Also a faw sausages are a bit bulky looking, so remember to keep the sausages with simple shapes, like it was explained [here].(https://d15v304a6xpq4b.cloudfront.net/lesson_images/0128c0e3.jpg)

TEXTURES

The textures looks OK. Remember for the texture exercises you should draw mostly cast shadows and not contours. You should look a lot to the references before making any mark copying it to the paper.

FORM INSTERSECTIONS

Good job on those, you got the lines where the forms intersect pretty well. The observation goes for your wobbly ellipses and spherical shapes, so try to ghost more you ellipses before drawing on paper and again remember to keep them confident.

ORGANIC INTERSECTIONS

Again you did a good job on those. They look believable as 3d forms interacting together. Remember that you can increase the line weight to clarify overlaps too.