|Greetings from the Critique Club
I'm glad you enjoyed shooting this one. That is at least half the battle in my opinion.
I think your overall idea was pretty creative, but somehow it missed the mark. As one of your commenters noticed, the lighting is a bit harsh, particularly on your main subject, the balloon. The background I personally was not too fond of. A plain coloured background would have served you better, either white or black (just my opinion remember). The watercolour effect is the thing I notice first about this image and really the background should be secondary to the subject matter (in this specific challenge).
Using borders is also risky on DPC. There are a lot of people who hate them and that can have a negative impact on the score. I personally like a border if I feel it somehow enhances the image and use them quite often myself. In this case however, I think the border was a bit heavy and is not really necessary. I think it gives the feeling that the image has been boxed up somehow. In addition, the balloon is framed a little bit too tightly to the left. I would like to see just a little bit more space to the top and left of the balloon.
I think overall you did a good job at attempting something a little bit different. A few things in your set up (including using a plain coloured balloon rather than a multi coloured one) could have pushed your score up over the 5.
Feel free to contact me if you want me to explain anything further.