♥ VISION I'm sure what you were going for is the cutesy outer shell with a gooey psychotic center. However, the only thing that really shows me she's a little not right in the head is the blood spattered background. If you didn't tell me she was a "yandere", I probably wouldn't have known!
♥ ORIGINALITY Cute cat girls that are a little crazy obviously isn't the most original thing in the world, but it doesn't make it any less of a good idea.
♥ TECHNIQUE The lineart is very smooth, but the shading can leave a little more to be desired. I see it's mostly cell shading and soft brush shading. Adding more tones to her hair, the front of her dress ( the lace going down the front looks very flat without any shading, as do the buttons ) and to her face will give it more depth and "wow" factor. Pick a skin tone, then a shading tone, then a DARKER shading tone to give a little more to overall look of your shading. Same applies to hair, clothes, etc. Also, from what I can see your light source is the upper left of the picture, don't forget to shade your character in accordance to your light source!
Your anatomy is decent, except for her arms. The right upper arm ( the part that comes out of your shoulders ) needs to be shortened EVER so slightly, and the forearm made a bit longer. Same applies to the left arm, but the way it's bent makes it look like her forearm is curved like a crescent, rather than straight. Looking up ref pictures or foreshortening tutorials will help out with that ^ ^
Overall it's not a bad piece. The character is very cute and her outfit is also. I'd also suggest you work a little more on the background to pull the piece together as one. Either add a simple pattern or draw the background yourself, because the way your character is drawn and shaded doesn't really fit with the background you chose, and they look like they're apart of 2 completely different things. I personally hate backgrounds, so if you do too, I know how you feel, but practice makes perfect.
Wow! this is really cool! I first noticed her eyes and mouth. Her expression is smiling, but she looks like somone you would not want to trust. I also love her dress, the black with there red bow. It was only after i looked at her face and hair and clothes that I noticed the bloodstains behind her. If you ment to do that, then it definitly has a yandereish feel to it. As I'm looking at her position, I see that it looks catilike, which matches her hoodie. The way her left arm is bent looks a little odd though. One other thing I liked was the wall corner that has all the light, and I like how it's shining down on her. Overall I think you did a really good job of making her look like the yandere you said she is.