if your skin is light...use the 200. If you have a medium skin tone...use 301.

I use the lightest shade # 200 and I have fairly light skin. I would not say that I am super fair but Im usually the second or third lightest color of foundation, for most manufacturers. And it does blend well.

As a powder junkie who has tried hundreds of pressed and loose powders, I can highly recommend Make Up Forever's newest loose powder - HD High Definition Powder. I LOVE IT!!!!! I apply it with my own sponge rather than a powder brush. (It does not come with either). It is colorless, blurs flaws, makes pores literally invisible and creates a fabulous matte look. A little goes a long way, so start sparingly with your application. Along with my Dior Airflash, it creates results that I love! And Sephora carries it!!! =)

Hope this helps!

400 - Honey is the darkest shade. It works well for tanned and olive skin. If your skin is darker than this I would be afraid it is too light for your skintone.

Honestly, I'm not sure you can. I recommend reading the reviews posted here on Sephora. I find that many of them do make comments about color & whether it was too light or too dark, etc. Usually the posters will describe their skintone when making their comments. This should give you some idea.

I can also tell you personally that 400 - Honey works well on suntanned or olive toned skin. This is the color I use. I actually chose the color for myself after seeing a picture of Jessica Alba in In Style magazine where her makeup artist detailed the products he used for her photo - and 400 -Honey was the color. This is how I was first exposed to the product.
Hope this helps!

You can also apply it with a foundation brush and get the same result. Just spray it on the brush and go from there, however, you will use more of the product by doing it that way.

Regarding it being oil free, I'm not sure...but you can check the ingredients, which are listed by Sephora on the product page.

Regarding blending - I spray it directly on my face & then lightly blend around my hairline, sides of nose, neck, under eyes, etc., by gently "tapping" with my finger tips. This works very well for me. I have read reviews where other users state that they actually blend it with a kabuki type brush & have great results. I haven't tried this, as my method works for me & is super quick & easy.

Hope this helps!

200 is the lightest shade and seems to be good for those with light/medium skin tones.

if you want to add coverage through the day...try the diorforever compact powder...it adds a similar finish to the airflash. If you want to brighten and conceal darkness...throw the skinflash pen in shade 002 in your bag....it hides dark circles...marionette lines...lifts brows....etc.

well...this foundation has a limited shade range..so you may have to compromise here...because its an airbrush finish though....you don't have to get the shade exactly right...as i recommend spraying the product on a blush brush or any natural hair kabuki brush and buffing from the cheeks outward....if your have golden undertones go with the 301....if you are more neutral to pink...go for 300.