it's funny because I never understand what you guys are talking about here...

I really don't understand the question .-.
But lets try.

Your Avatar is a 16-bit sprite, Just like any other NZC sprite

I work mainly (almost exclusive) with 32-bits sprites:
Can you see the diference?

Composed with 4 to 6 tones, using anti-aliasing, without black outlines, with a strong shading.
Some times the pallete make the sprite less 32-bit-ish the right sprite looks much better than the left one and the only change is the collor pallete, as you can see.

Another good exmaple is the shading,
I found this one in google:

the left sprite is 8-bit, use only 1 tone per color, the right sprite is converted to 16-bit, more tones added per color, 2 to 4, but it still the classic 8-bit mega man.

If you want to increase the quality of the sprite, change the shading and the pallete with better color references. Remove the black outline and if got no success, draw a new one from 0.