Cosmic Surgery:
How do I tell if I'm suited for it?
(btw, decided to post a photo of mine for reference...here it is:
)
Not trying to rain on your parade, but...
The top of your navel is much more suited than the bottom. I'd have to see it in real life to know for sure, but from your picture, the bottom of your navel does not look like one I would pierce. Also, notice the red line across your belly? That's where your stomach wants to naturally crease, that is another thing against you getting your navel pierced at all.
In reality, a whole heap of navel piercings are done on navels that are not ideal for them. It's just something a lot of piercers don't show any discretion for, because navel and nostril piercings are where they make the majority of their money. That said, a lot of those navels heal no worries.
If you're ok with the fact that you may have a scar if it doesn't work out, you may as well go for it. I personally would steer you more towards a dermal anchor, or nothing at all =)