This is my first challenge entry. I owed my friend Jess a portrait (I lost it as a poker bet), and she suggested I submit it.
To convert to black and white from the color original, I used The GIMP's channel mixer. I set the RGB values to 30, 59, 11 (respectively), and checked monochrome (but not preserve luminosity). Then I shrunk the image down for size, and that's it.
I realized later that with the aperture set to 1.8 (for short depth of field), in the sunlight I really needed to have set the ISO to 100, but by then my toddlers decided the photo shoot was over.
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Nice composition and model, but full sun will kill you on B&W. Try shooting under the shade of a tree or umbrella or wait for a cloudy day for much softer skin tones and controllable whites.