RTRT Support card

Well this is my 2nd graphic I have ever made and I must say I am SUPER happy at how it turned out! I mean its not that good but I think its good for my 2nd one. So yea. xD Please tell me what I could improve on and everything. Its suppose to be lighter at the begging of the horse from the lightning giving off light. Does that make sense? You know what, whatever. xD Its done!