Make your own postcards with photos.

Yes, you can. You have a great personality. You can also buy blank postcards and make them yourself. The person who designs postcards can help you design them for free.

Can be printed on thick white paper.

Generally, 250-300 grams of paper is most suitable.

Size: 162* 102mm (standard size)

But mobile phones are not necessarily clear, and digital cameras are the best.