Hi Melanie
It looks good, but I do have a few recommendations:
I don't like how the main menu sits sow low down on your home page. This is not user friendly. I'd prefer to see it in the same place on each page. If you click on 'welcome' - it just opens up the image in - that serves no purpose.
I like how you have the big boxes on the home page, these need to link to the key areas though. products, gallery, contact.
The quick contact email does not allow you to click on it and send an email. use a link like this - mailto:info@dyeandprints.co.za&subject=website enquiry
The bottom section is good. I often use something along those lines... newsletter subscription, social media and contact us boxes.
For SEO purposes, your title tag need some work. Elaborate a bit, use keyword phrases:
<title>Slipstream | Dye and Prints</title>
Hope that helps