This is simply stunning starting from the overall composition that gives a nice depth touch to the environment. The shades projected by plants, bushes and trees give a nice natural vibe as if you were really in that forest. I like how you can feel each texture of this forest, from the wood, to fungi, leaves, stones and grass; everything combines in a perfect dance of vivid colours and 3D-like volumes. Both panthers look fantastic, I can feel the raw power from Cameron's panther and the curiosity in the real life counterpart with that cute lifted paw.
I like how both seem curious at each other and seem to interact in a playful way (the lifted paws, the tilted head of Avatar's panther just to mention some).
I also enjoyed the animated gif that showed the entire making of the project. I find it inspirational for those who want to start practicing pixel art and I like when people decide to share how they make their stuff. Congratulations!
Everything feels so natural, I love it!
p.s. I am still trying to find the two leaves that made it in the final image even though it's not easy due to the high level of details, but I am having so much fun at trying to find them nonetheless because I love when people make their work interactive^^