I would try either the translucent or the light beige, You say you have a medium complexion with yellow undertones, between that and the fact that you are blonde, you don't want to go too dark. The darkest I would try is the medium shade, however it looks to have more of a red undertone than a yellow. Sephora has an excellent return program, so actually you can't go wrong. I hope this helps.

Putting on the foundation first is the key for me. Then I have only tiny spots that have to have concealer and I can dab it so it doesn't look heavy or uneven. Hope that helps.

I like using the HD primer under the Duo Mat powder myself. But instead of using the sponge applicator it comes with, I use a large powder brush and lightly dust all over. It blends in great! And from what I've read in mags, I only put a small amount of primer on parts of my face like the forehead, across the bridge of the nose, and the chin. It will save you money.

I just use the powder alone and I find that that's enough for me. Try just using the powder over your moisturizer...the coverage is definitely buildable!

I think it has neutral tones, I have red undertones, and use the green primer, and it totally neutralizes it.

You might be shade 200. That's what shade I'm at, and I think it's the second to lightest shade. Hope this helps!

No. 207

I have very sensitive skin too, but this powder has not made it break out at all.

I have oily skin and have found this product to wear quite well even on hot, humid days. The powder blends very easily so it is buildable. I tend to wash it off with cleanser and water, as opposed to simply tissuing it off. As for which shade is best, I really would ask a sales associate to help you find the best color.

Hello! Im my opinion, I would go with a shade 1/2 or 1 full shade lighter. The reason why it seems to go orange is because your skin tends to sweat through out the day and if you have a color that is a tad-bit darker for your skin, it tends to look more orange. It can also be that you need to moisturize, it may have been the complete opposite, your skin looks more orange when its moisturizes then when you just wash it an is free of oil. Just try out different color around your color base. Thats the great thing about sephora, you can try out and return/ exchange what ever you are not satisfied with, no questions asked ;)
Hope it helped a little!!