A vessel hangs above a treatment table. A narrow stream falls towards the forehead. The image is so recognisable that it can stand in for an entire retreat in a travel advertisement. What the photograph depicts is shirodhara, an external pouring practice. It cannot tell you everything included in the programme being sold.
Look closely at what a photograph leaves out. There is no account of the person's reason for attending, no comparison with resting quietly, and no record of how they felt a week later. An image can convey atmosphere beautifully while supplying no evidence at all for a claim about curing insomnia or another condition.
For a travel journal, describe the vessel, the room and the setting, and get permission before photographing a person receiving care. For a clinical claim, look for research addressing that specific claim. Giving the practice its own name is a good first step in both kinds of writing.
Further reading: Panchakarma terminology (Ministry of Ayush annual report) · Detox and cleanse claims (NCCIH)