Firstly use all header tags and alt tag. Do proper on page.
Your site is looking great, First you find your target keywords, can you fix canonical issues and do proper on page
Use quality content for your website and proper tags.
I think proper on page and off page will give you best business as well as traffic.
Because your site was promoting the high-quality image, content rudimentary, so I think that you should SEO off-page to increase website traffic.
Seo Review Factors:
Title & Description optimization
Header tags optmization
content optimiztion
Image alt optimization
Website page load optimization
URL optimization
Internal linking optimization
keyword density & proximity
Relevant outbound links
submit site to google and bing webmaster
Google analytics