As far as the image itself goes, I have to basically agree with WesternGuy there...I do think it's a rather lovely image (perhaps a bit over-saturated), however I just can't say it's anything terribly special either as you can find thousands and thousands of similar images with a simple Google search. Goodness knows I've shot plenty of similar images myself. That said, I also have to agree that it's your image...unless you were shooting this for a client who wanted something special, then as long as you're happy with it, that's what's important.
As far as the upgrade goes, my suggestion would be to ask yourself -why- you want to upgrade. Is there a specific reason? Is there something with your current camera's capabilities that you're no longer happy with? Newer cameras of course have higher resolution and many/most have better low light capabilities these days, so if that's a concern, then sure...could be time for an upgrade. On the other hand, as both a photographer and a musician, I also know that a lot of folks tend to get G.A.S. (Gear Acquisition Syndrome) from time to time...they see all the new toys available out there and start to feel as though their own gear is somehow no longer adequate.
With all of that in mind, my suggestion would be to decide -why- you're interested in a new camera. -IF- there are indeed features you could/would actually use, by all means upgrade, however remember - new gear won't make you a better photographer. The truth is that there are people out there who CAN take really amazing images with little more than a camera phone and conversely there are folks who own the most expensive gear money can buy who couldn't take a decent image if their lives depended on it. At the end of the day, it's not the camera, it's the person using it.