School - Basalt Island / Sketch

Another assignment we have is: Create your own (dream) island! This can be anything as long as you're able to make in interactive later!

Well I decided to put up some random words on google to see what came up. The word was: Basalt.
Hey thats sounds fun! Let's call it: "Basalt Island"!
However, what does that mean? I looked it up, seems it's a common rock that comes off lava. Uh-oh.
So my team will be a volcanic floating island! Now isn't that nice... I'm planning to do a lot of rough sketches, here's the first! Enjoy!

 Here you go! Sketch #2! (Going to make 3 or 4 in total and finish the best)