Thanks a lot for the comments, everyone.
Dark Rogue, well yeah, I'm pretty new to pixels, although I've been fond on drawing for a looong time.
And yeah, there is a reason for that, I wanted the smoke to merge into the background, and the black outline is just my style.
Thank you again guys.
*black(stupid typo...)
Plus, I forgot to add something, is there a reason that the top part of the smoke is the same color as the BG, but there's a black line around it, signifying it's still smoke?
Yep, it's a bin...