ADDITIONAL: previous sketch/draft for whatever reference. The struggle is real.

Some backstory questions first so I can figure out what sort of advice to offer:

1) Is it still 1968-ish in terms of the setting?
2) Does your Tits!Scout have 7 older sisters or older brothers?

Not too bad of a start!

Since a scout's job involves running everywhere, every day, I fetched a reference of female athlete physiques.

Side by side, you can quickly see you've got a bit of imbalance going in terms of proportions - your scout's top half is teeny compared to her bottom. Notice in the reference photo how shoulders always stick out further than the hips? And while their legs are muscular (dem thighs), they're still quite trim below the knee.

I also took liberty to put more weight to the pose. Remember if you're ever stuck, get a reference! Look at yourself in the mirror, take a photo of your own body, or resort to a photograph taken off Google Images.

Last thing was facial proportions, which I didn't really cover in the redline, but I figured it wouldn't hurt to have a closer look at Scootyboy's skull structure.

Hope that helps. Keep it up and let us see how you're going!

On the uniform side of things, the male Scout has his sleeves rolled up both to look cool in his own mind and to minimize the feeling of drag (whether or not the sleeves actually reduce his aerodynamic profile is an exercise I leave for actual physicists, but there's a reason most competitive running outfits are sleeveless).

The length/fit of the pants also make no sense to me. A quick GIS shows that running shorts are generally much more tight-fitting and not much longer than where the thighs might touch during running.

(Aside: Depending on the backstory, a female Scout might choose to wear a different uniform. Male Scout's is evocative of a baseball player's, but Little League didn't officially accept female players until 1973, so unless your Tits!Scout is wearing hand-me-downs it makes less "sense" for her to be in an identical outfit.)