I would love to know how you came up with her design.
So, I started with wanting each character to have their own color scheme. And I knew this character was going to be the main character, and that they were going to be sick 24/7. So, naturally, their color would be a sickly green. I wanted to try something different, so I made her hair a little spikey but poofy looking, and I knew I wanted to give her a pony tail. I thought "Scarves and sweaters are cute" so I gave her a scarf and sweater. Here's the original concept doodle I did.
Thank you for sharing. I think you achieved your goals quite honestly. She and the other characters I have seen are great.
When animating a gif, I always try to think that everything is looped. So if you can reel the animation back to a neutral pose so that it fires off smoothly in a loop with no jarring stutter, than you have achieved your goal!