Exposure Triangle
New to Fuji / photography in general and using an old X-M1 + XC 16-50. I think I understand the basics of the exposure triangle although struggling to understand how certain settings affect how colours are produced. The first image is at ISO200, F7.1, 1/350. Second at ISO250, F7.1, 1/1000 and third at ISO250, F10, 1/650.
Although the first image has a lower ISO, it has a larger aperture and slower shutter compared to the third image which has a slightly more sensitive ISO but smaller aperture and faster shutter.
It seems that even though I am trying to balance out the settings, a slight increase of ISO makes a bigger difference than the other settings where the image looks overly bright. Additionally I don't quite understand why it appears to wash out the rest of the colours so much?
Should I be sticking to aperture or shutter control and let the camera decide ISO. Any advice or tips on how best to shoot would be appreciated.