Nice practice! I think you have a good eye for placing the cross contour lines, though there is a tendency to flatten the lines a bit. Try drawing some cross contour lines all the way around, as if the subject were transparent, to get a feeling for what the full mass would look like, especially in rounded areas like the squirrel's tail or the puppy's legs where an ellipse can really demonstrate the curvature. It's also helpful to keep an eye on the curvature of the cross contour lines by the edges, where the curve would be the steepest but risks being flattened. Hope this helps, keep up the good work!

We all take breaks. It’s fine. Drawing isn’t a race.

Hey Cal, nice job on this from memory, it's pretty hard. The one thing you need to keep in mind is the curve of the spine, the neck in particular. What you have is too straight and it's attaching to the skull in the wrong place. I did a quick sketch to show you what I mean, I hope it helps :)

Great stuff. I love how you've sculpted out the first eye. I think in the bottom right eye, you lose a bit of the 3D form with the location of the eyelashes -- they are right on the edge of the eyelid touching the sclera. If you had left a bit of space between the eyelash line and the sclera I think it would have given it a bit more volume.