Your personal log book is just that - personal. So there's no problem in logging passenger flying if you wish, just don't include it in any 'grand total' of flying hours. Put 'Pax' in the operating capacity if you wish, and the total time either in 'other flying' or better still in the 'Remarks' column.
You only have to produce your personal logbook to prove that you have the minimum necessary hours for licence issue, so as long as your P1 and PU/T columns are clear enough, what extra things you put in your logbok are entirely your concern. Passenger flying, photos or whatever, no restriction. But make a very complicated logbook layout and it'll be a pain to total up the required hours in years to come! However, I wouldn't mention any H-o-P (Hand on pole) time without an FI or licence, if I were you.
Hope your C150 trip wasn't rained off!