Purple amplifies a blue eye

Yes, and it is a known color-theory effect. Adjacent cool colors amplify each other — placing a blue eye against a violet ground pushes the blue forward as the highest-saturation note in the frame, and the painting is composed around that. The watercolor wash is deliberately softer everywhere except in the eyes, which are rendered with extra precision so the depth of color reads from your reference photo rather than as a generic blue.

Almost, and that is the most flattering reading of lilac. The pale pink-grey of a lilac mask sits inside the surrounding violet wash, so the cat reads as native to the field rather than placed in front of it. The wedge of the face and the line of the body still come through as drawn shape — the wash blurs the color, not the form. If you want sharper contrast, a seal- or blue-point Siamese stands out more in this combo.

Better as a Wooden Framed Poster than as canvas. The loose watercolor wash and the soft petal-purple edges read most accurately on matte archival paper, where the wash has the absorbent texture the style was painted for. Canvas adds a woven texture that can fight a delicate wash at larger sizes. A pale natural-wood or whitewashed frame keeps the Provence summer mood — heavy dark frames close the painting down.