This tutorial will show you how to make it appear that egg yolks have faces using blending modes. Open the main image you wish to use in Acorn, File ▸ Open. Choose Filter ▸ Color Adjustment ▸ Levels and click the auto levels button (keyboard shortcut ⇧⌘L). If needed, make adjustments to the saturation, brightness, and contrast via Filter ▸ Color Adjustment ▸ Color Controls. The saturation has been increased slightly in this image.
Bring in your second image, File ▸ Add Images... A crying baby image will be used to give all the eggs faces.
Resize the baby image by using Layer ▸ Rotate and Transform ▸ Scale and Rotate (⌘⇧T). Adjust the size until the face fits over the egg and double click to commit your work. The opacity of the baby layer was decreased to 40% temporarily in order to see how it fits on the egg yolk.
Repeat this process to give the other yolks faces as well.