One 45 inch reflected umbrella, fabric at ten feet.

Shadows darker yet, not bad, still better than a direct light, but fading fast. The light source is becoming small at ten feet, and this hurts softness. But groups do require a greater distance, for the wider width of the light beam to cover them. However closer is always better when it is possible (closer to be a relatively larger light source). Do not place the umbrellas at ten feet for a head and shoulders portrait.