>>2575788It will be different for each subject and intent, but generally it will be coming from a direction that causes shadows to fall in a pleasing way, that also help to define the shape and figure of your subject. For instance, for a portrait, bad light would be very hard light coming from a strange angle causing very unpleasant shadows to fall on the face, from the nose and brow ridges. The OP photo has very pleasant light, because it allows for enough contrast to show detail and form of the objects in the scene, but not so much that important things are blown out or lost in shadow. it's also soft enough that it wraps around her face, rather than hitting directly and causing sharp shadows.
When looking for good light, you'll generally want to look for directoinality, intensity, diffusion, and angle. Asses those aspects and choose the variables that flatter your subject best.
Landscapes tend to look bland under noon-day sun because the shadows are all falling straight down, which is visually boring, and the lack of natural diffusion means that almost everything in your scene will be lit directly by the sun (very bright) or in complete dark un-filled shadow) very dim. so you lose a lot of shape, dimension, contrast, and gradation in your image. Shooting just after dawn, however, provides light coming from the side, which makes texture and form pop out. It also diffuses the light due to atmospheric scattering, so your shadows are much more filled in, and you have many more variables between hot highlights and flat shadows.
