Shading Rock - Help Needed

[TheUnknownVar]

I am currently trying to develop a floating island for use in a game, but unfortunately my skill is level is like... 0. So, this piece is sadly hardly pixel "art".
After looking all over the net, I was still unable to find an example to look at to teach myself a little bit more about this kind of rock shading/shaping.

Anyone out there have an example I could look at, or show a small portion of my pic edited as an example on how I should go about creating this island?
(Note: I'm not trying to ask someone to fix the pic for me. What I want is to get some help learning how to do this myself.)

BTW, I know it has no grass/top surface yet. I did that intentionally because I am trying to focus on the rock shading, not the surface right now.


Thanks in advanced everyone,
-TheUnknownVar

[Joe]

Well it's certainly been done before, so references are abound. My first instinct is why so red? If it's indeed floating, there will be a lot of blue (sky) reflecting off of it. The surrounding clouds will also reflect light onto it; a floating rock will be much better lit than the same rock on ground.

Edit: fixed links.

[yaomon17]

This is a pretty good reference from Owl Boy. Your rocks seem a bit too long and look more like wide noodles. Try to make them more like a collection of rounded prisms, a cluster of these

[TheUnknownVar]

Thanks for the responses guys,

First off I would like to say my rock shading will be a bit more "red" than normal for two reasons... which I probably should have mentioned:
They are from canyon rock that is slightly red and also, the sky background is a sunset.

Thanks for the great examples and tips!
I'll begin adjusting my pic soon!