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https://www.amazon.com/Vanished-Armies-Military-Observed-Countries/dp/0747807396

Plug for the book these can be found in. I can never not recommend it.

I'm not at all well versed on Commonwealth uniforms, but you might want to hit /r/genealogy with even broader questions.

They're rather solid.

E: Nevermind, I see that you already did.

As a side note, purely from the uniform perspective, if you have the original photo, try scanning it in higher res, for instance we can't see the cap badge if it's at all visible on the original photograph. Anyway, a better scan would likely be more helpful. If you only got a phone, Google's PhotoScan on Android is good. Something along those lines obviously exists for iOS, too.

Wouldn't consider myself exactly as an expert as I could obly read secondary Ebglish scholarship on the matter.

That said however If you're just keen on late Qing uniforms Philip Jowett's Late Imperial Armies 1840-1911

If you're more interested at the massive mess that was late Qing Military History, I suggest McCord's Power of the Gun: the Emergence of Modern Chinese Warlordism which goes in length to show how local armies of the Green Standards took over China as power brokers which previewed the Warlord Era of 1916-28.