Step 3: Reduce the number of colors, check out your palette
I choose the settings shown in the image. Basically, play with it until you get something you like. I ended up with 30 colors.
Here's the output of the color count:
$ ./count_colors.py 01-flower4-reduced_pixel_count.bmp 02-flower4-reduced_colors.bmp
There are 1827 colors in this image, and 1833 pixels:
There are 30 colors in this image, and 1833 pixels:
So, we reduced the image from 1827 colors to 30 colors! This is a good thing ;-)
Check out your palette for any colors that are too close to one-another. If any are very close, you can keep reducing the color count.