Well your design is simple , that is not wrong a lot of big sites are/were simple but you need more pages a lot of content and something to take your users eye ! And now days if you want SE traffic a responsive design is a must , your site it may be looking good on mobile but also need to be responsive in the google's eyes which is not take a look here :
https://www.google.com/webmasters/to...dwomentime.com !
Good luck with your project
