did you use a premade base for this or is it done from scratch? not to be mean or anything it just looked a lot like some I've seen on
KawaiiHannah's website
anyways onto crit
its pretty good for your first time, but i believe this is room for quite a bit of improvement as well
it would help if you did the thickness for all the outlines the same, the hair looks pretty think and painterly which makes it look a little odd on your base
and i think it would be better if you put the same kind of shading in the hair and clothes as you did in the eyes, which seem like the best part for me
hair's shading is... kinda wonky for me, looks more like you took the brush tool and painted it in instead of using the pen tool and pixelling it in, it could also use some shine
the cloths don't look like they have any shading but i just might not be seeing it
the site i linked above as some great tutorials on colouring and shading which might really help you
i could also link you to a forum topic on another site that has a HUGE list of pixel tutorials if you want