Yes, you can be quite happy with your result, but is that because it was a test of your skills or because you really liked the gimmicky aspect of the lightshow?
I would suggest extending your skills even further by scanning the shot to a digital file, then learning how to perspective correct.
One of the limitations of wide angle lenses is getting that falling-over-backwards effect when shooting reasonably close to a subject - unless you can afford a very expensive perspective correction or tilt-shift lens. However one of the real bonuses of digital is that you can easily correct this effect now in software.
TIP: Mastering some of the corrective effects of software can improve your images and help you to understand the limitations of cameras.