You're fine One of the reasons I'm on the forum is because I like reading and writing long posts.
Sorry, I guess the middle of the nose = ball of the nose.
You did good so far with this drawing, it just needs an extra 3-5 minutes. It's like you started a race, kept a good pace and then stopped like a meter or a foot from the finish line. You're so close!
You can add light layers of shading until it's close to the ref. If you squint/blur your eyes it's easier to see the band of shadow that connects the two nostrils.
Try to think of the nose as a pyramid. When the light comes from above, the sides, or straight ahead the bottom is always going to be noticeably darker than the rest of the pyramid. Only when the light comes from below will it be light.