I really don't like blingy/'done' nails; I much prefer to see plain, clean, nicely shaped natural nails, maybe a bit of clear polish.
Weird trouser comments - I think a cigarette pant and decent leather ballet flat looks great.
I'm also no fan of the 'statement' necklace/shoe/scarf. If you've nailed your outfit, then you don't need it, and I often find a statement' item a bit jarring in an otherwise chic outfit.
A well-cut shift dress with a slash neck looks great with ballet flats (again) and bare leg-look in warmer weather.
Cashmere sweaters, cardis if you can afford it, the best you can get otherwise.
For me, I prefer clean, slightly boxy lines, so Toast is my go-to place for quite a lot. I really don't like a cluttered look, so personally, I'd prefer no bright nails/necklaces/scarfs/matchy matchy accessories etc. as it always looks a bit try-hard. Good sunglasses/glasses, really smart leather bag/briefcase/whatever and a plain silver bangle would be me going crazy with the add-ons
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All of that said, if you're good at what you (and it sounds as though you are), don't stress too much about this aspect. Good luck with the business.