What immediate first aid should be provided if a client faints during a tattoo?

Laying the client down and elevating their legs is the most effective first aid response if someone faints during a tattoo. This position helps increase blood flow to the brain, which is crucial for someone who has experienced syncope or fainting. Elevating the legs can help restore circulation, thereby aiding recovery. It's important to monitor the person's condition closely after helping them into this position to ensure they regain consciousness and stability.

Applying a cold compress on the head might provide some comfort but does not address the critical need for blood circulation to the brain. Sprinkling water on the face or giving candy to someone who has fainted are not appropriate actions, as these could cause choking or not assist in resolving the underlying issue of low blood flow to the brain.