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Like the big logo :)
I think the main thing that would improve it is a lot of spacing, all feels a bit tight and claustrophobic. Get some big spaces inbetween columns and boxes and it'll all feel a lot nicer.
I'd also work on the typography a bit, main headings could do with being a little more stand-out.
Hope that's helpful!

Good tip! I tend to be quite aware of the need for open space, which is apparently something I took for granted in this design. I'll be sure to space things apart more. And I've already tweaked my heading fonts, looking forward to showing you the updated draft.