Classic Ninja Turtle - first ever sprite + Violent Ken custom anim

[X Gamer 66]

On that note, even if you do reference the image, I recommend spriting a different angle and pose than your reference. It's not very interesting (or helpful) to copy your reference directly, be it by free-hand or trace.

Another tip: add more contrast between the shades of your colors. It will give it a more vibrant and appealing look. You have a pretty good numberof shades right now, just work on contrast and more noticeable shading.