Using a reference is fine, but it's better to link it in your description :  People can then compare and see what you created yourself. For example here, the choice of colors is completely yours.

I can't understand the last word. xD

it is (I cannot say "I approve") or (I cannot say, I approve).

thanks for commenting.

 Oh my........ I cannot say I approve.

yep, some of my latest pixel arts are like this, so, the outline is just copied.

but the shading is mine.

 looks slightly familiar.

http://www.youtube.com/watch?v=7niAz1QpWKs

ever so "slightly"