The feeling is there...
but practice is the key to getting your point across. The piece feels like the majority was drawn in the time that u listened to the music u described. (fireflies is a very inspiring song) Not to say that is a bad thing. Some of my best works were done in a flash because of inspirational music. The question any artist has to ask themselves when their finished with a piece is "am i really finished" and I've found that the answer is usually no. The piece will never really be finished until another person can look at your piece and literally feel the same feelings u have when u look at it.