You should convert your images to CMYK (Image > Mode > CMYK Color) while working on them in Photoshop. That way you CAN set your CMYK percentages - it will also help with getting the colors you want.
Also, Photoshop is a raster based program for designed for pictures. If you have Illustrator, that would be a better choice. However, if Photoshop is your only option, try to make sure your images are all at least 600 DPI at actual size.
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