Aesthetically it looks cool, but I have no idea if the geology is sound.
Next stage The old caldera that became the bay. 58,000 years ago a volcanic hot spot formed under the island causing a large mound to form. The mound was mostly large gas pockets. This gas was slowly vented over time leaving a massive cave system that made the mountain a brittle bubble. When the sea broke in the water eroded the supporting structure. This caused the slow collapse of the mountain into the ocean forming the present bay. Does that work?
Aesthetically it looks cool, but I have no idea if the geology is sound.
Basically a caldera happens when volcanic eruptions are of such volume that a void forms in the magma chamber and the overlying crust... falls in. It isn't a bubble blown upward by gas pressure and then bursting.
Otherwise, in terms of appearance and such it seems good. Except... Scale is a problem. A 100 mile caldera seems to put Yellowstone to shame. This wouldn't be a dinosaur-killer eruption. More of a kill-the-dinosaurs--no-the-mammals-aren't-taking-over--they're-dead-too kind of ecosystem-killer. Maybe there will be some algae left to keep some oxygen in the air, but it won't be pretty.
I've been wanting to do a city called Caldera Bay for some time, but my caldera would be much smaller. Maybe Crater Lake-del-Mar.
Astrographer - My blog.
Klarr
-How to Fit a Map to a Globe
-Regina, Jewel of the Spinward Main(uvmapping to apply icosahedral projection worldmaps to 3d globes)
-Building a Ridge Heightmap in PS
-Faking Morphological Dilate and Contract with PS
-Editing Noise Into Terrain the Burpwallow Way
-Wilbur is Waldronate's. I'm just a fan.
Redid the bay area. looks much better.
OK I'm adding rivers and lakes. look good or should I make the rivers a little thinner?
Looking pretty good. I don't think they necessarily need to be thinner but, instead, taper a bit more as they get to the source. Your mountains look great, BTW. I'm going to have to try that. Repping you if I didn't already.
M
I agree with Mearrin on the rivers, although you do have a few of them tapering nicely. Also, great job putting them in the "cracks" of the mountains. Looks very natural.
Gidde's just zis girl, you know?
My finished maps | My deviantART gallery
My tutorials: Textured forests in GIMP, Hand-Drawn Mapping for the Artistically Challenged