I have seen examples of this technique on Pintrest and Splitcoaststampers. The image is heat embossed with white powder and then you color on it with markers. The first time I saw this the woman used Sharpie markers to color on the embossed areas. It's rather difficult as the marker gets clogged up with bits of embossing gunk and you have to wipe it off now and again.
Not too bad, but I have to say that I don't think that I will make another card like it. The sentiment is from A Round Array and is also embossed. The flowers are a stamp called Flower Garden by Stampin' Up. Have a lovely day! - Heidi