Hi Nina! This is such a lovely piece! You should be very proud of yourself! I love the environment design and it is so cute! The only issue that I could see is with the perspective on the chest. The center of the chest is just slightly off on perspective. If you draw an X connecting each corner of the box, then a line to the vanishing point from there it will show you the center of a box in perspective, you can continue drawing these X's on each split half to further subdivide if needed.
It's a really minor thing and I didn't notice it until I pulled it up in photoshop so here it doesn't really bother. The chest is super well done and the thickness on all of the areas really adds so much and the curves look good to! Really well done here Nina! Keep it up! I want to meet this chicken!