Well, First of all, I must apologize for my bad English.
The technique is really, really good. The background colors denote some psychosis, which, in this case, is completely accurate.
Pinkie's smile and eyes are extremely expressive, almost flawless, the colors and lights on the mane are well distributed, the shading also is very good.
Also, Pinkie is in the right position of the image, her right eye is in the "Golden section"(the eye detail is simply amazing), and as an overall rating, It is one of the best images I've seen in a lot of time, your work is incredibly good, keep up the good work.
first of all,this is a beautiful piece of artwork,the colors are vibrant and expressive,the shines on her hair,fur,bow,and eyes look beautiful and glossy.and you layered the colors perfectly,and shading is very realistic
the way you added the messy-hair-effect,really shows how crazy she is.
and her expression is very realistic,you really brought out her psychotic-ness.
i love the background,it really expresses her emotions.
and i love the drawing itself,she looks exactly like she's supposed to on the show.
and even though i have seen many people draw pictures of pinkamena like this,yours is by far the best,and i think the blue bow was a nice touch,keep up the gr8 work!