In your drawings you seem to have focused on outlines. With the shapes you often see lines through other lines. Like with the guinea pig you could have the head line go through the ear as your would first draw the head shape and add the ear later. Watching the monkey video helps clarify a lot what stan does. He moves away from the actual reference. To focus more on the shapes and changing them at will while still making sure you recognize the animal as the monkey (or whatever animal it is you choose).

Try to focus less on subject on more on clear strokes :) and maybe start with penguin? this crazy lad is not easy :)

That's great, as proportions were not the main part of the this practice and you did great on line practice :)

You're a beginner placed in vast ocean of "what we dont know", so any direction to start is great :) I love that actually you've added more character to the penguin that there was in reference. Good job, keep it up :)

For my beginner eye, shit that's perfect :) All is on point, and where you had a problem there is next line to it that does the job and still looks clean and with purpose. Exactly as Stan prescribed and as bonus great 3d form showed.

Confident line is better than on point scribbly one, but I can imagine that accuracy comes with time. At least me, I've never used whole arm to draw/write and when compared with many year of writing using only fingers it's just lack of experience in it :) like many years gap of experience between two.