1. Start with the paid deliverable
Describe the work before naming a camera: outdoor family portraits for digital delivery and moderate prints; indoor headshots with consistent backgrounds; property interiors in small rooms; an unrepeatable wedding day. Each creates different demands. Test focus, exposure, color, low light, working distance, and output quality using the equipment you already have.
Define a repeatable acceptance check: eyes in focus at delivery size, consistent skin tones, sufficient detail for the promised print, and files that open in your editing workflow. Practice in conditions similar to the assignment, not only at home in ideal light. If your current kit passes, put funds into the most consequential reliability gap before replacing the camera body.