Step by step on how I'd do pixel art...enjoy.ewe..
1. Sketch on a canvas size 550x560 with normal brush
2.Lineart with Pencil tool 1 px
3. Base colour (pencil tool)
4. Shadowing + additional (pencil tool)
5. End + effects + adjustment (Pencil tool + colour adjustment)
*Ocs (c) *orihichan