I'm working on building a tropical island with a central volcano using Photoshop and Wilbur, and having a rough time of it. Here's what I've got so far:

The height map
Erobelis-take-3-height-map.jpg

After processing in Wilbur
Erobelis-wilburified.jpg

I've been following Arsheesh's Eriond tutorial, albeit translating the instructions to Photoshop as I go. It's been very helpful. But as you can see, the results so far aren't quite what I'm aiming for. It's a problem of scale. The entire island is supposed to be about 45 kilometers at its widest point; but it comes out looking like a continent. For reference, I borrowed the basic size and shape from Efate, in the Republic of Vanuatu.

I'm also not sure what to do about the calderas on the two volcanos. Logically they ought to be lower than the surrounding ridges, but then Wilbur treats them as a basin and starts adding rivers.

What should I be doing differently? And advice would be appreciated.