hi, as far as I know you can set your portfolio out however you want as long as it is within the page limits and it is clear and easy to understand. In the visual design development section as well as your sketches you need to have evaluated the strengths and weaknesses of your design regarding aesthetic and functional aspects of design and all that stuff. Also, there is no limit to how many designs you put in, it can be more than three, as long as they show development of inspiration and all that stuff. cut out your pictures and just try them in different combinations in your book and see which way works the best and is easiest to understand. The markers just want to be able to follow the design process easily. dont worry about strict ways it has to be set out, just stick to the page limits