First of all good start!
Now a few things:
1. you should save your sprite into .png or . gif or .pcx format because pixel art and jpg don't go together. Because jpg is a format for images with a true color palete and saveing your few color sprite in it only make it look disort.
2. outlines, you should always outline with little darker color than area that you wanna outline is. You can see this on my paintover.
3. try to use colors in much interesting way, your sprite looks pale and his eyes are black. Try to put some imagination in it.
and here:

3x
'dule'
Now a few things:
1. you should save your sprite into .png or . gif or .pcx format because pixel art and jpg don't go together. Because jpg is a format for images with a true color palete and saveing your few color sprite in it only make it look disort.
2. outlines, you should always outline with little darker color than area that you wanna outline is. You can see this on my paintover.
3. try to use colors in much interesting way, your sprite looks pale and his eyes are black. Try to put some imagination in it.
and here:


'dule'