Wow, your store is beautiful! You did such an amazing job with the design and branding. I love the off white background and red highlights, it looks great. I also really love your logo and the G branding throughout. Your branding of the watches with city names is also a great idea! It really helps to group the designs together and makes them easy to associate.
In checking out the collections I noticed some of your products did not have product descriptions, I would highly suggest writing them! This is the last place your customer is before they press the Add to Cart button. Although they make take some time, there are lots of great guides on writing effective product descriptions.
Otherwise, I also noticed on the home page you did not have a popup for emails. There are many free email popup apps in the Shopify app store and I think they would really benefit your store. Emails are important to collect because they're a direct access to your current and potential customers.
I would suggest setting up a popup after a few seconds with a one-time coupon code such as "15% off you first purchase." This will help incentivize your customers to leave their email. That way, even if they leave without making a purchase, you can still add them to your email list and hopefully convert them in the future!
Overall, your store is amazing! Really impressed and looking forward to seeing how your business goes.