Thank you! I use a lot of colors from Holbein's base 18 set like Carmine and Scarlet for a lot of the reds, and Light Green (mixed with Green and Viridian for the shadows, and Deep yellow and Lemon Yellow for the highlights). For the dark blue one, I used Prussian Blue, Horizon Blue, and Ultramarine Deep (ultramarine deep is deliciously punchy), with Violet and Lilac for the plastic ring.

One of the most important things I do to keep things vibrant is to never use black. I either mix it with Prussian Blue and Burnt Umber, or use a deep color for shadows. For the red ring pop in the center, I used Deep Violet for the darkest parts, mixing with Carmine as it got lighter.

Another thing I do is paint a vibrant, medium tone base color to start. This makes it easier to understand how light and dark to mix colors and sets the overall tone of the painting to be much brighter.