thanks for the feedback, i'll go back to the jump later as I really suck at animating jumps and spriting them, I will fix up the stance later on, thanks for the info on the blur (but what green, I am using an alpha png (green is only for the animations), does mugen not run them fully?).
Glad that I'm at least improving as spriting is only a side hobby for me hehe, /
As for the landing, It looks bad on the loop, but I'm going to shade it in later to make it look more like an after image.
Two questions: does mugen have a number of frames limit? and how do you make the images appear on the board what is the img code thing
edit: how's this for the stance- http://i112.photobucket.com/albums/n163/ULTIMOS/killuastance_zps807a9028.gif?t=1411934382
The tags to post an image are these:
[img][/img]
In photobucket pick the second link (Direct) and use the tags, like this:
[img]http://i112.photobucket.com/albums/n163/ULTIMOS/killuastance_zps807a9028.gif[/img]
and the image will appear like this one:
(http://i112.photobucket.com/albums/n163/ULTIMOS/killuastance_zps807a9028.gif)
I don't know if Mugen 1.1 can allow you to use alpha colours like you want to show. But if it is for 1.0 and WinMugen, if you remove the background colour there will be a lot of other green colours:
(http://i1066.photobucket.com/albums/u402/GodofDeath94/blurisnotgood2.png~original)
but if it is just for the gifs, then I won't complain.
Now I understand what you wanted to do with the landing.
Mugen hasn't a number of frames limit. You can add as many frames as you want to make movements and animations smoother (like in Street Fighter 3).
The stance is ok, I would just re-do that part in the shoes because it's up and down and I don't like it, moreover I think the shoes don't behave like that but remain static. It's a common way to make animations, but it's not a good one: you need more than just cutting and pasting pixels up and down, you need actual editing.
I know, maybe you don't have any idea for a stance, and I can understand it. So why don't you try to make him breathe (not from his legs) or stand still with some wind movement? He's a killer, so one of these concepts should work well for him.
The hair uses dark colours to define some spikes, it should use lighter colours. Where does the light come from?
Also, when I wanted to make an edit I noticed you have too many colours! Seriously, 189 colours! When I checked it, zooming in, I realized it looked like a jpg, but it's not, then I indexed it and the Colour Map says you're using 189 colours! That's too much!
So my advice is to cut the number to 20 or 30, in other words use much less colours (but not more than 100 unless you know what you're doing), this way you can give your character more details and at the same time fix the parts that look off, like the hair spikes.
I've re-made your sprite with colour separation (that's why I used different colours for the skin and his T-shirt):
(http://i1066.photobucket.com/albums/u402/GodofDeath94/Killua_Zoldyck.png~original)(http://i1066.photobucket.com/albums/u402/GodofDeath94/Killua_Zoldyck_outline.png~original)(http://i1066.photobucket.com/albums/u402/GodofDeath94/Killua_Zoldyck_outline_defaultpalette.png~original)
The lightsource is in front of him (or at least I tried). 30 colours against 189 colours: less colours and better results.
I shall try to animate it.