I tried to do something a little different here, since the main subject isn't the closest thing to the camera. I played with the exposure in Photoshop, to make her face brighter, to draw more attention there. I also desaturated the colour (but not fully) on teeter tot.
Bowness Park is the ideal place for photos on rail tracks. It has a miniature train, that currently isn't operating, running through the park. So, you can use it, without fear of arrest, or being run over.
For this image, I changed her blue top to green to match the tree. The railing was made grey, to avoid distraction. And, a couple objects were removed. The other version is in adjacent in the photo stream. Feel free to comment, if I made it better, worse, or neither.
So, this time, I'm using off-camera Sigma DG 530 Super Flash (camera left) with Cactus v4 Triggers. I kind of like the shadows on the face created by the flash, since it gives it a more connected feel.