Thanks! Yeah, I'm not too good at shading yet but I'll work at itVery nice! You've done a super job of getting the proportions accurate, very well done I think you should start trying to shade and tone properly now rather than just colouring in in one direction.
When you start off with learning to shade and tone, just use the side of your pencil to blend it rather than trying straight away to go all in and draw each hair as its much harder to get tonal values when you're not sure on them yet.
I'd start by looking at the reference photo, and picking out where the darkest points of the horse are, then shading those in, from there, gradually work out towards the highlighted areas and you'll have a much more three dimensional drawing