The most difficult part of the animation in any framework, is develop a good sprite sheet for your game. This is most challenging part of the development work. For me , it is bit daunting, not challenging.....)
I am not following mugen fighting engine standard at this moment. because it is very detailed. So my spritesheet will not follow mugen standard as well. Currently I am working on sample sprite sheet something like this:
These animations I have modified though ,from original sprite sheet. I would like to add more animations as well. These animations have been added manually by using ms-paint tool. Personally I like that tool because of its simplicity. One of the important thing to note here is that I have to align the individual sprites equally, else the animation will not work as expected.