Ori - Pixel art

So I really wanted to try doing some pixel art after I saw this piece probablyorion.deviantart.com/a… from ProbablyOrion. It doesn't looks as cool as his but I think it ended up pretty  cute.

Also I have noticed that when saving this from sai the quality was lost , like it wasn't as clear and crispy. I tried different formats and the same thing , has anyone else encountered this problem? :/ I might be doing something wrong , like maybe the options or smth...I dunno.