Here's an attempt at a genetically viable winged human design, where the avian has six limbs. I chose this limb positioning to allow for the most flexibility in the wings while maintaining some semblance of available arm movement.

The skeleton sketch shows the main bone structure for the avian, the original shoilder blades and arm connection area replaced for the wings. The arms are moved down beneath the wings where a section pair of shoulder blades are. The rib cage was moved down slightly, as well as the spine being extended. The huma tail bones moved to stick out more for the avian tail.
The bone density follows similar to birds, being more hollow to allow for ease of flight.

The muscle sketch is mainly how the wings connect, having them go all the way down to the hips.

The final, full sketch is with the general feather placement. A winged human would need extraordinary wings to be able to actually use them in flight, thus leading to the feathers at the base of the wing ending at the calf and the wingspan to be a few meters.