Greater job on your use of solid constructed, geometric forms in your use of perspective cubes, and all of your animals thus far. Amazingly functional things to behold.
I'm not getting enough of the caricatured flow of the organic forms and perspectives of the animals and cubes. How would like to push them further with 30 minutes of 30 second gestures of animals and scenes? As a result, your forms and forces will be less stiffer, and more dynamic, vital, and energetic. You don't need to worry too much about the vanishing points and perspective lines, as long as you could feel out the angles in this particular warm-up session. Keep up the greater work, and I hope you've found these totally helpful and supportive.
I can just about see that you are practcing boxes, perspective and basic structure. Could you take better pictures/photos in future please, it isn't easy to see much. Try using better lighting or a scanner, you can also adapt the contrast digitally later. Good luck. Keep up the practice.