Hi Leah,
I can't really think of the best way to approach this C&C so I think maybe a bullet point list will work better.
1. That blue you're using in the background hurts my eyes. The shade of the blue and the black background your using the for the main site, half appear to blend into one. I think you should choose either one colour for the whole thing, or, make the two colours completely different from one another.
2. Overall, I don't feel the site has any sort of hierarchy. It's all a bit like "LOOK AT ME FIRST! LOOK AT ME FIRST!" and I think my eyes struggle to know where to go. I think you could improve that by having something you want to work more with, featured more prominently.
3. The way that BLOG is in capital letters on your navigation bar and the rest are typeset differently to that, instantly puts me in a bad mood. That's an easy fix.
4. Comic Sans?
5. Even the use of Comic Sans can be overlooked sometimes, but, some of the Comic Sans in the orange squares seem to be bold (mascots, logos, illustration) whereas Gifts, Caricatures etc aren't. I'd probably go through and choose one or the other.
6. The headings for the likes of "Say Hi on Facebook" "Wizzy Witch Collectibles" All look a little stretched vertically? I'd maybe change the font there.
7. Underneath your profile picture, the paragraph appears to be all over the place. I'd try and line it all up so it looks really crisp and neat?
8. The footer is all higgledy-piggledy too in terms of typesetting and what is going where. Useful links just looks stuck up there for no apparent reason.
That's just a few quick observations, nothing too harsh or critical, just a few things that instantly stick out and make me think you could just do it that little bit better
Cheers,
Tony