What is the most effective way to improve the image quality in this scene?

The most effective way to improve the image quality in the provided scene is to add lighting. The image appears to be very dark and grainy, which is a typical result of low light conditions. Adding additional lighting will significantly enhance the camera’s ability to capture clearer and more detailed images. This solution is supported by Axis Communications' documentation on optimizing image quality, which highlights the importance of adequate lighting in achieving optimal camera performance.