Not bad! You've got the right idea for sure, but I think you could actually dial back all the lights a bit. As mentioned, you're losing detail along her hair, edge of her arms, etc. This is caused by the reflection off of the background, indicating your lights are too strong; ideally, you'd want more separation between the model and the background (as in 8-10'), but in a basement studio, that might be un-doable.
To get your background lights correct (assuming you don't have a flash meter), use the highlight preview on your rear LCD, and adjust the power until you just start to get a hint of 'blinkies'. You don't need to have the whole thing totally blown out.
As far as the key lights go, your lights are in a good position for a traditionally lit portrait, but not so much for a high-key shot. Notice the shadows forming under her eyes, and around her mouth? You want to eliminate those in high-key work, so bring your lights down so that the modifiers are square to the subject and at about eye-level. If you have small umbrellas, doing a true, high-key full body shot is going to be a challenge, due to the fall-off as you get toward the floor, but a bust shot is easy. If fact, I often do these with a single key light right at lens axis. I use a 50" SB, pointed right at the model and shoot with my lens literally along the side of it.
Keep practicing, you're 98% of the way there already, which is a LOT closer than most people get.