The makeup is done and just before leaving for that special occasion or an outing you will feel, 'no, this is not me. The makeup is not suiting me at all'... this is because you did not choose a right make up for you.
For instance, generally, all those who posses dusky skin have an oily skin type. For this skin type, first and foremost, it is necessary to apply powder and then blend your face with a proper foundation that is chosen to mix with your skin tone. If you posses fairer skin tone, you might have a fancy for dusky skin and vice versa. But when you are applying makeup on your own, it is better not to experiment with the tone of the foundation and chose that foundation which is in the same color as your skin tone is. If you want to change your skin tone through makeup, it is better to consult an experiment, not to mess up with your look.
If you have a fair skin tone, then go for a foundation color that is one tone high than your skin tone. Apply rose color or natural shade for your cheeks, natural color for lips and eye shadow as well. If you are going for a party or a special occasion, both when choosing lip color and eye shadow you can experiment with bold shades like brown.
Irrespective of the skin tone, if you want to cover up some marks or spots on your face mix some liquid concealer with the foundation and apply.
If you have a dusky skin tone, then choose the foundation that is nearer to your skin tone. It is better to choose light colors or natural shades as lip color and eye shadow.