I hope this helps a little figuring out how I did this picture:
Using the formula Z³ - 3a²*Z + b to create a cubic troll with eyes.
Most important for the eyes to show up is high iteration count, minimal 400 but better 700 or more to make them appear.
Also important is to init a with exact 0.32 or -0.32 because they won't show up otherwise.
The pictures show my Java program FraktalTest, which I used to create the picture. While you might not have the same application one can transfer the formula easily to UltraFractal or any other fractal program that allows to write your own formulas.
Thanks again to
, who introduced me to this wonderful formula.