Hello there! Such a fun cactus! The only thing I would do is emphasize the shadows a bit more to create greater contrast between light and shadow. This helps us avoid making the designs look a little flat when the goal is to add volume through lighting and shading. :) You can also add a bit more color vibrancy to the shadow areas using some purple tones, as I did. Just make sure that if you introduce a different color, it stays within the same value range. Otherwise, it might look strange if you paint a light purple in the shadow areas. Hope this helps! | Artwod Feedback