even if you take someone's art, it was a single frame, you still made it into an animation, that takes skill, nothing wrong with that as long as you credit the original author of the still image, and take credit for the animation.
Some people are great with art, but not both (meaning animation).
I'd love to make walking and climbing sprites for my platforms but suck majorly when it comes to that.
So far the only animation I've done is four frames of the viking looking left.
I was serious with my offer, give me your sprite/drawing and I'll help you making the animations if you help me with my programming.
Synfig Studio isn't that hard to use, I may take the sprites and do them over on profile and use synfig to do the animation, paper mario like but still, a lot faster than doing some of the left animations for the viking would be. Just look at this:
Now imagine doing it so it looks right when facing the other way...
Although now that I see it moving... It either has nipples on his back or he is a cousin of stretch or the elastic man, because then his right shoulder ends above his pectoral WTF?