If you want to learn lighting try to get it right in camera. So for now forget about fixing in pp.
Dark house doesn't matter, you using strobes, Now why put umbrella pointed upwards? Think sun, light comes from top. So put that umbrella higher up pointed down. You can also just keep it pointed straight but higher up than the subject. The 2nd umbrella, I don't think that is firing. Look at the catch light in the eyes. You see bottom left umbrella but center of the eye looks like on camera flash.
Now regards to shadow on back ground, your umbrella is small or not close enough so making shadows harder. Or your on camera flash is too strong and causing the shadows. Take out on camera flash, point the umbrella down like I mentioned and back ground problem will be gone.
Here is single 30" reflective umbrella positioned camera right (look at catch light). No other light.