The characters design is a little too busy in the scope of colour mainly. As it stands with the galaxy texture for her body, it's very hard to make out any detail and the viewer's eyes are more naturally drawn to her armour booties on her hooves because its the one colour that stands out the most from all the rest.
I think the design would benefit from making her body just a flat colour and only letting her mane and tail stay all galaxy shimmer, sometimes less is more.
Otherwise, it is a nice concept and the stained glass effect wings are a nice touch.