Photo quality is it's quite good considering it's price tag. If you compare this smartphone to the typical samsung, iphone, huawei flagships of course you may conclude that the camera is not good at all.
Color tones are inclined to "natural", not like Samsung cameras that tends to make over saturated photos.
Main camera:
Lacks a bit of detail and color deph. At 48mp mode detail improves but zoom, hdr, color dazzle options are nulled.
Night mode gives vivid colors but are blurry. To countermeasure this issue I use Gcam or "Manual mode" in the default cam (long exposure at 100 ISO).
Telephoto lens:
Photos zoomed up until 4.9x are digitally zoomed. Then optical 5x zoom kicks in. Zooming higher than 5x makes blurry grainy photos. For this reason I only use 1~2x or 5x. Colors lack a saturation but can be improved with "hdr" and "dazzle color". Or by using Gcam.
Wide lens:
Makes photos with noticeable color aberrations lacking even more detail than main lens, but still makes much better photos than using these cheap attachable wide lens.
Macro:
Strangely the wide lens is suggested for macro but I think the main lens is more suitable due to higher image detail. Closest focus distance of main lens is approximately 8cm so you cannot take very close-up photos. But by buying these cheap small attachable lens you can make good macro photos.
Coming from a single lens smartphone, I'm very happy with the Oppo Reno 10x zoom as it can cover almost all camera modes. Zoom, ultra-wide, macro (by using attachable lens), manual mode, RAW(Gcam), astrophotography(Gcam), 4k 60fps, etc. I'm only disappointed at how sometimes the images lacks deepness.