That was very nice of you to make this for your friend. She sounds like a sweet person. I'm sure she'd like it. There is so much I like about this picture. The woman in the picture is beautiful. She reminds me of someone from the Zelda world with the ears. The white outfit makes the woman appear innocent and pure and reflective.
The background is extremely diverse. When I see other pictures, the ground and sky are different colors, but they are drawn the same way. In your picture, many things look vastly different; the sky as a light blending of white, blue, and yellow with no brush strokes or outlines at all (except for the glare from the sun), the ocean has the light reflections, the grass is beautifully drawn with many strokes, and the indents and carvings in the ground. Extremely good job and I hope your friend's never gloomy again.