hmm in fact i see NO potential in those sprites.
They are in a really low quality, some of them are way to bright, there are odd pixels everywhere and it looks very blured to me.
But may you have potential... you just need to discover it.
Get a good Graphic Programm (ex.
Paint.net (not my favourite),
Gimp (The best in my Eyes), PhotoShop (Eiither Download it anywhere for free [Attention! May be Illegale] or buy it [Attention! Huge Costs])
Outline your Sprite.
Get a good Base.
Watch some tutorials. (Ex.
Prince Freeza's Tutorial,
Zxo's Tutorial,
Blue Phoenix's Tutorial)
Get a good Colour Theme.
Shade it! (Watch again some Tutorials)
Make Hair. (Watch the above Tutorials again)
Make some Final Effects and last Touches.
Hope it helped
~Hacker
(Correct me if i'm wrong or missed a step)
Edit:
Every Words in () are clicky.
v Every Thread needs a bad one :P
Stay safe, don't take drugs and save in .PNG if uploading.