What is a good portfolio size when using facing pages so that I get the best screen cover online and looks good on print as well? A4 is too small and A5 looks too long on facing pages. I need an in-between.
You should choose the size based on content. Your portfolio has mainly horizontal or vertical images? Square or rectangular? In any case I suggest you the 17x24 cm format (like a book); or 20x20 cm (very stylish); or 22x32 cm (like a magazine).