I printed the photo with people and I folded it în a white box. I put the bits and pieces of chalk on the photo. Because I didn't want shadows, I covered the box with a white paper. The single light source was the sunlight that entered my room. I put the camera inside and took a photo with 15s exposure.
Then, I used Photoshop for Auto Levels and Hue/Saturation, because the photo was too red.
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This was a very interesting concept for the Bits and Pieces challenge; however it was a bit risky, as voters could easily think that it wasn't done with basic editing if they didn't take the time to see that it was validated. In general, there are a couple of technical things that would have made this image stronger. First, the wide-angle perspective of the background image makes it look like the horizon isn't level. This could have been fixed prior to printing the image. Second, you might want to reduce the noise in the background image a bit. The noise doesn't match the sharpness of the chalk, which weakens the effect you were trying to achieve. Lastly, the child's toy directly behind the chalk looks like it should have better focus considering how close to the chalk it is located. I'm not sure how difficult it would have been to clone this out before printing but it would have been worth the effort.