Wig

I'm not entirely sure whether to put this in "Health" or "Fashion and beauty". We'll go with F&B as it's more an aesthetic question, even though there's the health side to it.

Okay I'm sick of my hair. In recent years it's gone so thin, and believe it or not I haven't had a haircut (aside from my fringe) in over 7 years, yet it's gone from mid-back-length, to chin length, all on its own!
It won't bloody grow.

So I've had lots of suggestions from people - check my iron levels, magnesium, B12, thyroids, wear a silk bonnet, and so on and so forth. I'm going to bring it up with the GP as soon as I get chance.

But in the meantime I bought a wig - it arrived yesterday. Honestly does it look okay, or does it look very obviously fake? It's synthetic, not human hair.

I want it to look as similar to my pre-thinning hair as possible. Do you think I need to take it to be styled by a hairdresser?

Suggestions / opinions / advice on the wig would be appreciated.

For reference:

Pic 1 is from 2016, when my hair was fine (fine as in there was nothing wrong with it - not fine as in thin).

Pic 2 is from a couple of weeks ago. You can see how thin and short it is now

Pics 3 and 4 are from me trying on the wig yesterday.

I don't think the lighting in picture 4 is doing you any favours. It makes one side of your face look very pale, with other obscured by dark shadows. However, I don't think I would have guessed you were wearing a wig in picture 3 and 4 had you not said.
You say you "want it to look as similar to my pre-thinning hair as possible." Does that apply to the colour in addition to the style? Picture 1 makes your hair look essentially brown, with a hint of red, whilst picture 2 makes your hair colour seem much more red. Pictures 3 and 4 seem to have blended the style from picture 1 (albeit "fuller") with the colour from picture 2. If that's what you were going for, it worked.

If you will permit me, I’m a complete stranger to you, the sort of person whose reaction you’re interested in.
I would not have noticed you were wearing a wig at all. Not at all.
For what it’s worth, I can see the merit in going to a hairdresser — for the confidence of having a professional hand look at it and make truly informed suggestions.