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Would it be possible for your relative to create the illustrations for this website? It would really help give some authenticity and consistency in the design. Once you add her pieces it might actually conflict with the illustrations you've chosen.
I would recommend keeping the fun illustrative parts of the website to the header and maybe little accents. But keep the rest of the site relatively simplistic and take out the backgrounds you've chosen for the cart and the round graphics at the bottom. THey will compete with her work.
I think you're at a point in the design it's important to pull in some artwork - even if it's not the final artwork. Once you see how the colors of the products work with the rest of the page you might start to see what I'm referring to.
If your relative can't or won't create illustrations for this website, I recommend you choose a fun color palette and stick with it for the site. Maybe the pink and purple from the unicorn. If you need help - colourlovers.com and kuler.adobe.com are great resources.
This unicorn has a great look to it. You should tie that same style into the logo/name. You have a bright vibrant unicorn but pastels...
Keep playing with it, you will see it start coming together magically before your eyes!
I think you have hit the mark as far as clients requests. On a personal note I am not fond of the Liana Patterson Font/design/word aesthetic/type. It borders on looking dated (think original Photoshop layouts.) I think what brings it "into the now" is the last 3rd of the page. "I am more of a developer by nature and would love to improve my design" I would not have guessed it -well done.
I know I am beating a dead hoarse here but it still feels very girly to me. That may not be a bad thing depending on your target market. I know you mention that your target market is women, however, are you really only trying to attract women that need graphic work? Something to think about...