i would personally like a larger calender and i think an engine bay or other pics off to the side of what ever that car owner would like to show would be a great idea. for those that dont have the best of a cam you could use the current pic size and allow for a few smaller side pics.
and for those that dont believe there engine bay is worth showing, well think of it this way. i dont have the nicest looking engine bay, infact at best i would say mine is average. but im dang proud of it. its what i did and it hasnt blown up in my face. so ya, i show it off with pride even knowing the guy next to me has even more money into his.
and even if everything under your hood is horrible looking you might even have that 1 mod that someone else didnt think about or couldnt figure out. its your work, its your pride, no matter what others think of it be proud of it imo.