Into the Night

i made this mainly to practice a few things. I practiced changing the brightness on the background and the horse. (I made both darker). I added the clouds to make it kind of a cloudy night. I also painted a mane for the first time, and this was the third time ive painted a tail. I'm practicing these things because in about a week, i'm going to be getting my graphics tablet and i really wanted to practice first. idk if i'll put this on Hp or not yet though. I may just keep this as an example and keep it mine. Anyway. Opinions? Critiques? Thanks guys  

Credits
Background: little-spacey.deviantart.com
Horse: chunga-stock.deviantart.com
Manip: hpelement.deviantart.com