Overall I loved this. I really think that Finn's new getup is cool, original, and he NEEDS to wear this in the new game. I thought the sword looked a bit flimsy and small, but the swinging motion he does more than makes up for it. The fighting stance reminds me of street fighter, and one can only imagine his move set. For your first pixel artwork, this is amazing. The movements were fluid, the costume was cool, and Finn's stance looks as though it came straight from the show. I say this from the very core of my being: please do more.
Into what i can see , the outif looks outstanding very good! But the spriting needs fixing , the sword , especially. The feet dont look very good and the shading is bad i bet that you can improve . But as this being your first is really good However, the animation is kind of bad. And i dont get it about the backpack. The sword swing looks really REALLY undecent and the ears make just one move , while he is fully moving his body. But you can improve TOTALLY TOTALLY improve more so keep trying and dont give up on anything of this NEVER NEVER!!
I always love to see idle animations. Can I invite you to try a free online pixel animation program? It has skeleton mode and onion skin and it shows a preview of your animation while you're working on it, which means you can make really good animations much easier! Here is a demo: [link]