The most realistic lighting artists go for is through the use of an HDRI combined with other lights. Lighting is often smoothest with multiple light sources. This sort of ‘uneven’ lighting can be caused by using a one-point lighting style when most even lighting consists of at least a two-point lighting method then can be further improved through three points.
While it usually depends on the location of your render, HDRIs come in handy for outdoor lighting, and emissions and other lights work well for indoor scenes. If you’d like a good breakdown of how these point systems work, here’s a video that could help!
Here is an additional site with free HDRIs that could help you as well! I suggest searching YouTube for further explanation on HDRIs!