I can't say for sure, but I think some of the "off feeling" might be due to how elements are being scaled. This is something I struggle with a lot so I'm particularly sensitive to it I did this really quick and crude redline/overaly to try and illustrate what I mean:
The red lines are just locking down the horizon line and vanishing point based on the floor grid you have laid out. It appears to be slightly higher than the green line, but not by much.
Next I extended the canvas downward a bit to estimate how tall the whole girl is in dark blue. It's useful to see her full body for an exercise like this so you can scale her whole "footprint" and not have to guesstimate as you move back in space to where her legs will be visible farther back.
Then I simplified her form into a rectangular box (light blue) that can more easily be understood in perspective, and lastly I scaled her back to the same depth as the front-most light posts (the purple line between the lightposts is just showing where they are relatively, and the blue box with the magenta outline is where the character would land in that spot if you follow the vanishing point back from her foreground "box". Lastly the magenta boxes I roughed in on top of the girl box was just to show roughly how many girls tall the light posts (and tree) are shown currently.
At the moment the light posts appear to be about 3.5 to 4 (I think some of my rectangles are longer than others LOL) girls tall and the tree is ~4-5 girls tall. Of course in art things can be whatever size you want, but I wonder if they look a bit off because typically they might be more like 2-3 people tall?
With another very quick and sloppy edit, here's what it might look like if the background element scaling was a little less extreme:
I left the magenta boxes and old top point of the tree to show the difference a bit. Again though, that's only if the stuff in the back isn't supposed to be really super huge, sometimes that is fun and looks cool too In cases where you do want to emphasize just how huge stuff in the back is, though, you can always consider adding a 2nd (or 3rd) vanishing point up above the tall stuff and converging elements to that as well. typically you hear about that sort of vanishing point in 3-point perspective, but you can actually use them in 1 or 2 point as well as the single or 2nd point.
This produces a much more exaggerated and dramatic effect which isn't always appropriate, but is great if you really wanna push how incredibly massive something is. An imposing tree like that decked out with all sorts of lights and decorations might look really cool @u@