Overall, I'm pleased to see you've taken many of the points into consideration and am already seeing improvements in your work! Starting with your organic intersections, lines are fairly confident, ellipses are properly alligned with a small exception shown here, and forms slump and sag over one another with a believable sense of gravity. I would've liked to see more sausages, but a few good sausages is better than a large number of sloppy ones I suppose. Overall, solid job!

Moving onto your animal constructions, these are also well done. I am definitely pleased that you're using additional masses a great deal, layering them together and building upon them bit by bit, all without having the need to slap in too many superfluous contour lines. While the masses themselves are on the right track, there are still ways you can push these further as shown here.

When it comes to your leg construction, you're starting to think of these as a chain of sausages and starting to think about how to fit the additional masses into the picture - that's a step in the right direction. The only thing to mention is how the masses you're using are limited to those that impact the silhouette without much consideration to those that fall within it as shown here. Look for opportunities to push these masses into other forms to make the construction feel more grounded and give us clear places to use inward curves and sharp edges. Again, the dog's leg demo is perhaps the best example of how you should generally be approaching these.

Continuing onto head construction, solid work overall. Much like the leg construction, you're thinking about the additional masses, and the masses you're laying in fit perfectly around the carved out eye sockets. This includes the cheek muscles, forehead, and the smaller masses around the muzzle. The only issue I have is with the head of this duck. When it comes to it, students have the tendency to draw the cranial mass too large or students are unable to lay in the additional masses because the head they're looking at is obfuscated by the fur. Other than that, your head construction is coming along nicely!

As a whole, you've improved a great deal. As a result, much of your constructions are coming along nicely. I do think if you keep the points outlined above would help push your constructions even further. On that note, you're doing a good job overall so I'll be marking this as complete. Feel free to move onto the 250 cylinder challenge.