Hello aeshnabx!

Starting with your organic intersections you're making a good use of the organic forms, the shadows are solid and run well across the forms and the forms feel solid too in general. The only thing here is that some of the forms feel like they are going to fall. Make sure you imagine the forms falling and you draw them on their final position, they shouldn't feel unstable.

Moving on to the animal drawings overall you've done a pretty good job:

-First of all about the belly thingy what you can do is to draw the initial sausage way curvier on the bottom so you don't have to add massses to the belly. Adding masses to the top of the forms is much easier than adding them to the bottom, so make sure you always do it like that if you can. That being said, this demo of the donkey covers the masses on the bottom of the forms in the cases where you have to add them no matter what, so make sure to give it a read-reread.

-Overall your use of the basic sausage forms is pretty good, so nothing to comment on that! You're keeping the forms simple and adding mass when necessary with additional forms, which is what you're expected to do. Intersections between forms are also drawn most of the times and they feel believable, so nothing to comment on that as well.

-About contour lines I think you tend to use them too much. Try to stick to maximum 1 contour line per form, and always prioritize contour lines at intersections instead of intersections on the middle of the forms, because they're much stronger.

-Another thing is additional forms. Like I said earlier you've approached them pretty well overall, but sometimes you wrap them around making the forms a bit weird. Here's an example. Overall you approach them well like you did on the rhino, so just try to keep an eye on that on future attempts.

-Lastly on textures you're doing some good attempts already at them. But in general you try to do way too much texture. Keeping only a few spots of fur on the silhouette already makes the brain think the it's an animal with fur, so you don't need to fill the silhouette completely. The shapes are also a bit too repetitive, which is normal, but make sure you do your best to make different shapes so you have more variety. Remember as well that on textures you can increase the density and add more cast shadows like on the lesson 2 exercises, so don't hesitate to experiment with that as well.

One very important thing on this is that you take photos of the exercises before doing the textures, it isn't very important here as the other drawings showcased your work pretty well and I can still see the construction on your texture drawings, but it's a good idea to do it as it'll make it easier to give you better critiques.

So! Overall you've done a pretty good work so I'll mark this as complete. Good luck on the cylinder challenge, dont' forget to ask any questions you may have, and keep up the good work!