Can I charge different prices — one per photo and another for the whole album?

You choose one model per album rather than running both side by side. When downloads are set to paid, you pick either "guests pay per photo" or "guests pay once and can download any/all photos," then enter your amount for whichever you chose. So a 500 GB-style full-album sale at, say, ₹2,000, or individual frames at ₹50 each — your call, but it's one pricing structure per album, which keeps the checkout simple for guests and the accounting simple for you.