This is some seriously gorgeous traditional work, I'm amazed by pretty much all of it. First of all the crafts aspect of cutting out different pieces and putting them together to nicely frame it as a little collage, very cute and very well executed. Second of all your artstyle is just top notch, I love those facial expressions, the cute little chibi Cassandra meshes perfectly with the more normally proportioned ones, you flow between these styles well or. I dunno I might be throwing out a word salad here but I hope you get what I'm saying. Thirdly, the penwork and markerwork here is just phenomenal, I love the hatching with the pen is great and your marker strokes with the red coloring (I'm assuming it's marker I don't have the most trained eye) are so, so clean. I'm astounded at how clean that is. Wow. The little dragons are also adorable and colored very smoothly.
Also I just think Cassandra is neat.