I am very much a beginner in Illustrator and this Helen's class helped me overcome all my confusions. I admit, I watched the class many many times, stopping and repeating, forgetting to drink water or eat- it was a fight...
I can't recommend more this class to people of all levels. Having an instructor who covers all questions even before they come to existence is a real luck and pleasure to study.
I worked in CMYK and my jpg images are medium size to make them not heavy so the colors are very different, I played with recoloring the umbrellas but here I show only couple versions made with black or light outline on different background color.
Helen's technique of changing the background color is excellent ! I can't be more happy learning from her!