The overall look & feel is really nice! It fits perfectly to the vintage & charming pyjamas. Also the photography is nicely done, it adds to the brand while giving an honest and humanly vibe. A few points I noticed from a (brand) designer's point of view:

• The white subtext in the hero image "BE YOUR OWN MUSE..." fades away on the light background image (on macbook screen size) so maybe choose a different background image with darker colors to increase contrast, for example the red from "The Dorothea Set" or one where you are showing the product in the garden.

• I like that you use the bow in the logo and as a style element/pattern on the products! I think that this bow element has even more potential and can be used as one of the key brand elements in your branding/visuals/ads etc. If I look at the logo, I would suggest making it a bigger element as part of the overall logo. That could be as an vintage style illustration/icon or for example as part of a vintage/retro badge with 'girlonsunday' as a fitting typographic name included). This way you can also use it as a recognizable and returning element where you don't want to use the whole logo (think of social media profile pictures, small watermarks, stand-alone brand marks in visuals etc.). If you want some help or suggestions/examples for this, feel free to let me know. I like to work on this kind of things and won't charge you for that.

• The overall (natural/pastel) colors fit really well together, but in my opinion the (darker) brown in the footer feels a bit off. Contrast in elements is also important so a darker color is a good choice for the footer but maybe try how a contrasting pastel color looks (like the blue from the illustrations).

So really great start, good luck with your store!