Interesting I admire you thinking out of the box. The thought is great but implementation isnt reading as well. I just think the gland idea becomes a little foreign to the viewer despite being correct. Ask yourself how can I make this part of the design in a more appealing way. Is it used as a defense mechanism- like a blow fish? And maybe its around the gullet of the ape like some birds. I look forward to seeing how you take this further.

These look awesome!

Awesome! I like the movements feeling.

Nice but pay attention to volumes and weight. Youre losing some essential form and surface area of the understructure- dont just copy but analyze and problem solve. The pose in each final model conveys weight so the study should do the same.

Nice job on these. Very diagrammatical and clear. I like seeing the flow youre finding too. It does get a little too simple at some points indicating knowledge not fully there but it will come. Good job all around- This will help your personal design work.

Messy is okay when its all about learning. Youre not here to make pretty drawings but to learn and understand how to create poses on your own. Draw from the inside out- skeleton to superficial forms. Not the actual bones but think of how the skeletal structure when the monkey is hanging. In one to two lines draw the rhythmic bend and flow then build volumes on top of that.