I am a warm skin tone so this is a usefull guide as to what colours are best and what coulors I may not be best in. I also know I go well with navy blue, so I don't know how that works in the colour chart.
Use a bobby pin to make polka dots on your nails. You have to bend the bobby pin apart in order for it to work but after that it's the best thing ever for making polka dots! I did it for my birthday last year!