Aesthetic: Aurorea has been such a cliche on this site that you really need to make it different from other similar shots to score high.
Technical: The sundial (which is foreground here) seems to be burnt out due to long exposure. Background Aurorea is well captured.
Challenge: Well yes- this certainly is painting with light. So it does fit the challenge.
Conclusion: Overall an average composition. As one of the comments says - the beautiful background is not complimented by equally beautiful forground. Considering this is just second submission from you, you have faired well. Looking forward to more submissions from you.
I'm by no means expert in area of photography. My comments are purely based on my limited understanding of technology and art behind digital photography. Apart from doing detailed evaluation of your submission, my intent is to learn different styles of photography by critically evaluating selective submissions. If you've got any questions about this critique, please feel free to contact me via email or PM.
I'm jealous of your surroundings, but I wish you'd done something a little different with the composition -- having the sundial so close to the center just doesn't work well for me.
The sky looks great but the sundial almost detracts from it. Perhaps a different composition, without the sundial in the centre might have looked better?