Hi Imma!
I had some difficulties too in dressing for work. I always thought I look fine in the mirror but my honest friends were not always impressed. The best tool ever for me was...
Taking pictures of myself!Take a picture of yourself in the morning before work for a few days (preferably a nice spot with good lighting and not too much mess in the back), like the one in the attachment.
Once you have a few photos, you can see yourself a bit from a stranger's perspective, as if you are looking at magazine shoots. You can see which outfit matched your shape better, which colour makes you look alive or tired, and whether you look "professional" or "prudish". This also helped me see how I actually looked without makeup (=very young, a bit plain) which was
very different from the image in my head.
Also, I have an honest friend and my mum, whom I share pictures with, and they give me honest feedback. You can share with us on the forum if you want, we are honest but not brutal hehe.
Before I started my current job I took some time during a weekend and start trying outfits and shoes combinations. Again, taking pictures in the same place, same pose, and it helped me immensely to decide on go-to outfits. It may seem like a lot of work but it saved on a lot of thinking later on.
Regarding jewelry, I cannot be bothered with necklaces! I wear one of these earrings most days. They are big enough to be noticeable and yet very classic so can be worn for decades.
Good luck!