when i open that image and zoom in, i see a couple amber here and there possibly, but you need at least 30x magnification to see them properly. If your phone has that type of zoom, that can work too. But, digital zoom has its limitations.
The cheap currency ones can work, jeweler's loups, or spend a bit more for digital microscopes that connect via usb to just about any device with an app or a pc etc. Might pay for itself winning a contest here, lol.. no, i don't work here and i own a cheap $5 currency checker.. says 30-60x, but it can't focus when the plant at 60x.