"I love the light. This is unmistakably your elegant style and I'm interested to know how you achieve that with acrylics, which are very different to use than soft pastels."
I briefly answered this in the comments in my last post, but did promise to enlarge upon it, which I will try to do now while it is fresh in my mind.
Actually, there are two main things in that question which need addressing. One is HOW TO ACHIEVE A SENSE OF LIGHT and the other is about STYLE. The third issue is techniques in different media.
I will deal with this one first. "Style" is a somewhat abstract concept, and has nothing to do with achieving a sense of light in an image. Style is the artist's own "handwriting". for example, Vincent Van Gogh had a very distinctive style - it was to do with the way he applied the paint, in linear strokes all over the surface. Here are two totally different types of image - a portrait and a landscape - yet he used similar mark making in both: