The first thing that struck me about this piece is the vivid colors. The Hot pink attracted my attention straight away, this then directed my eyes the the fine detail of the hair created by tones and highlights in the form of different shades of pink. This use of highlighting using forms of different colours is reflected with the creation of the ears, eyes and the formation of shadows.
The eyes ave captured the personality of the original character of Pinkie Pie. The shocking blue of eyes being one her most famous trademarks are injected with detail and life with the small lines in lighter colours. If there was any suggestion to improve the eyes I would suggest elongation the eyelashes to portray Pinkie Pie's feminine side as well as her hyper side, that has been portrayed with her hanging upside down.
I can honestly say that you have now become one of my favorite pony artists! I love this piece, and although it remains the same style as the ones before it, it manages to have an identity of it's own that represents Pinkie Pie extremely well! I love how you amplified her characteristics by making her to be upside down and giving her a massive smile. your style is magnificent and I love your use of variations in soft textures and color work! The lighting and shading contrast is beautiful and the subtle details on her mane and eyes make this a truly outstanding piece! I do so hope that you continue to make more of these! I would definately love to see many more! Amazing work as always! Kind regards, Princess Luna