First I took a picture of the empty glass against the blue backround. Then I filled the glass with yellow food colored milk and took a picture of the glass with the yellow milk. I combined the two pictures and cut out the 1/2 blue and 1/2 Yellow glass picture to the size of the original glass. I taped the picture to the glass and then set up the glass against the original blue backround. I then took a picture of the pitcher pouring Yellow liquid into the glass to make it look like it was filling just the yellow half of the glass.
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It´s an interesting shot! I had noticed only some issues with light. Probabilly you had used the internal flash of your camera to do it. Leaving this typical reflexions and geting a bit underexposed picture. Try to use more closed alternative, directable light sources, as table lights or table spots. This allows you to get more light in two or more directions, in some cases eliminating the flash need. Other thing is to remember to bounce or difuse the flash, simply putting a napkin over it.