I can see you're getting pretty comfortable with perspective. There are still issues to iron out but theres already improvement between the first post with perspective and the last one
If you have the money I'd recommend investing in a good perspective book or lesson by scott robertson if you havent already. Easily the best resource for artists. Technical enough to cover everything important, but also loose enough for quick perspective sketching.
That said, it looks like youre not too sure about how to place those ellipses. Some of them are quite close, but others are off so im going to assume that youre guessing to some extent; apologies if thats not the case but heres a quick rundown of how they work.
The Minor axis of the ellipse is the important thing to think about when drawing them. Essentially, the minor axis is always going to be perpendicular to the surface its on. In other words, if you put an ellipse on a cube, the minor axis will point to the VP that the ellipse is facing
Heres an example
Another example, so if you have an ellipse on the ground, the minor axis is perpendicular to it, ie straight up and down
And If we look back at your drawings we can see some of them are pretty close but others are off
Hope that helps.