hello i'm just very new to photography (less than 6 months) but i've been taking tons of pictures and took a beginners class. i show my pictures to my friends and one of them who's working as the marketing/advertising head in a small start-up company asked me if i could share my picture with him so that he can use it for his design projects (note he said "SHARE"). my question is, i am just a beginner and this is my good friend. i haven't really responded to his question yet because i don't know if should charge him or should i just give him my pictures for free? and just ask him to put a note at the bottom of his designs that photos were taken by me? please advise. thanks!