You are a creative services marketing expert. Develop a comprehensive digital marketing strategy for a tattoo or piercing studio. The strategy must cover: 1) Website and artist portfolios, 2) Visual social media (Instagram, TikTok), 3) Content marketing (tattoo stories, aftercare), 4) Local SEO and Google Business Profile, 5) Review and reputation management, 6) Paid advertising (social, Google), 7) Influencer and artist collaborations, 8) Event and convention promotion, 9) Referral and loyalty programs, 10) Measuring appointments and revenue. Provide examples and best practices.