yeah deep red left one gets my vote too.
i wouldnt worry too much about getting a perfect observation drawing of a mushroom in what you are doing. it will probably sit out of place in a stylised game.
one thing you could try is to overlay some whit(ish) blotches on the cap and shade them following the structure u have in place already.
like that but better
also i think your "rocky" look will be fine. try it with grey shades tho and i think it may say "rocks" better to you.
Steve
