In India a ceremonial Hindu marriage with photos and enough evidence is considered as valid marriage and even a girl can file 498a and DV against the husband with such proofs.
But if the husband is a NRI or foreign citizen then everywhere the Higher courts,MEA,Embassy all ask for MARRIAGE CERTIFICATE and these photos,videos and witness are not entertained and all these 498a,DV,extradiction,declaring PO and LOC will fail.
So if someone going for a fight with NRI or foreign national with pics,invitation cards and few witness then please forget they can only trouble the in laws and the relatives and maybe the dog and cats of the husband living in India.
In Hinduism a marriage with Banana tree is considered valid but the MEA and Foreign Embassy cannot accept such marriages :)