Pippin,
As has been mentioned, try to get bright, even lighting across the subject and avoid high contrast backgrounds eg a white wall behind the darker mill table. Flash can be good but can also make certain scenes look worse.
Maybe also, if possible try to capture only the area of interest ie get closer in if focusing allows.
Like many, I use a mobile phone for 90% of my pics….it’s more than good enough, and it’s 5 or 6 yrs old. An iPhone has probably the best overall camera/software set up….I use an Android phone.
Also, within the camera Settings, find the settings that allows you select the area (small, medium, large) that the camera sensor will try to make look the best….this will affect Exposure (eg brightness) ….and what part of the subject the camera Focuses on.
So maybe dig out your camera’s manual, have a re-read of it and particularly look at how to set up the area of Exposure and area of Focus. I find that Settings have a mystical habit of ‘adjusting’ themselves as soon as my back is turned, so check them before each picture session. Good luck.
Ches.