All three outfits have distinctive waist definitions. I could try the first one with a scarf for sure, maybe I'd go with a more subdued tone than the one pictured. My waist is not that trim.
The fitted jacket on the second model is so nice, the layering doesn't look too casual, maybe because the top and jacket are the same color. Good tip to keep in mind.
More fun layering in the 3rd pic. I hope to use up a lot of old vests and tops this way.