Starting with your organic forms, they're mostly good done, though there are a few that are a bit off. Here are some examples on your first page, and here on your second.

Last thing is that the ellipses degrees on them aren't shifting. Don't forget that even if they're straight they should change, as shown in this example.

Into your bug drawings, they're looking mostly solid, but there are a few issues.

-Your sausage forms are a bit off, there are some drawings where you get them mostly right, like on the scorpion, but in others you tend to go away from the simple forms you should be drawing. This is basically applying what you did on the organic forms exercises but to a larger drawing, the approach to drawing the forms is the same.

Here are some examples, in general you tend to draw stretched ellipses instead of sausages.

-On that same picture I made notes on the next mistake; you skipping constructional steps at times. Like on the spider helmet thing, don't draw complex curves directly, break then down in simpler ones as I did on the example. Another same thing linked to this is cutting into your forms. Avoid this as much as you can. If you can do it additively do it additively.

-And another thing is drawing through forms. Even if the sausages are on a part the viewer can't see like on the ant back legs, draw them. Some more examples.

And from there it's mostly a repetition of the previous issues, can't find anything else. There are a few places where you add forms and wrap them around pretty well, such as in this drawing (only issue here are the sausage forms).

The use of the sausage forms improves a lot through the set; there are still some a bit off by the final drawings, but it's much better than on the beginning. So I think it's more a matter of trying to be more conscious about these issues:

-Don't forget to draw intersections between every form

-Do your best to wrap up forms around the others, and try to be conscious about the form that they should follow.

-Don't forget to draw through forms.

-And do your best to aim for the sausage forms, don't mistake them with stretched ellipses. If they are particularly hard what you can do is to place a few dots as guides for the ghosting method, which will make drawing them a lot easier.

Lastly, be careful with the textures. You shouldn't do any kind of form shading, as you did here on the legs. When tackling texture approach it with lesson 2 techniques, that is, only drawing cast shadows.

Overall like I said, solid job and improvement! Good luck on lesson 5 and keep up the good work!