Pro: Wow, what a great portray of Sailor Venus! The pose looks mighty yet seductive. Her face is so serene and soft, which fools the eyes because she is more powerful than how she's portrayed. That costume looks wonderfully crafted; it looks like what the sailor scout suit would look like if they were real. Wonderful professional work there! Nice use of lighting for this too; it works well with the overall picture.
Cons: I think what's the most distracting thing is the trail of stars. Some are following their own random path and with the way they are scattered it degrades the lovely cosplay. I think there might be a little too much white in this picture. You have a little orange going on but it just randomly goes down to white. In my personal opinion, it just doesn't look right.
Suggestions: I think you can make the stars smaller but more of a streak of light. In that streak of light the stars can trail upwards. I think the bottom line of stars could be removed as well because the main focus of this picture is Sailor Venus and not her Love Chain attack (that's the name of it, right? It's been a long time since I've watched Sailor Moon). If you really want to keep the white, then maybe add a orange border around the piece. Give white significance, such as the glow on her finger tip surrounded by white and then it branches off into orange. Or maybe get rid of the white entirely and substitute it with a yellowish light and branch off into an orange. You know, to bring out importance with the color orange.
Final thoughts: This is a lovely piece and with a great cosplay. You can do more with this piece, but that's up to you. Keep up the good work.