Hey Hlam,
I think the image looks good, and seriously, I love those twin lens cameras. About the only thing I would
suggest is to think about shadow detail and subject/background separation when you're shooting in high contrast light such as in this boxing club.
In a situation like this, if using natural light, or even an artificial light source, I'd have a soft whit reflector
just out of frame to reflect a little light into the shadow areas...easy to burn it down, but impossible to get detail
in if there is none to begin with. Take a minute and really look at the light falling on your subject, and think
film...your eye will see more detail than the film will.
See how your left shoulder and face has no separation with the background?...just a hair of rim light would take the image up 10 notches.
Look at some images of Arnold taken by George Butler at the original Gold's Gym in the 1970's...there are some really
great images...note the background separation in some of them...it's dark, but not black.When trying to bring out
the physique of a boxer or muscled person, top lighting really enhances the musculature...the image of Arnold
below left was lit by a window which was high on the wall of the shower room....note the bit of detail in the face.. Also look up Art Zellers work...amazing.