I need 2 sets of adverts designed to promote 2 of my business service on social media

Design details: I wish to promote the following two services on social media

- Sell your watch
- 0% and low interest finance

I wish to have 5 x designs for each service. I have included some examples for each which we are currently using. These will predominately be used on Instagram and Twitter (but also other social media channels) so would prefer a square design optimised for the two main channels
Banner sizes: 800 x 800 (or please recommend based on your expertise)
Banner content: As per design details
Ideas for the visual style: Images of products available from our website
Website url: www.globalwatchshop.co.uk
Website information: We buy and sell luxury swiss watches
Extra notes:

Please provide 1 sample of your design ideasa