For me it is not woryh as most 99% situation natural light is far better. Other think is walking with all stands ,making fuss, like working fast and not vissable.
Off-camera flash is not over the top if it is used appropriately. Natural light rarely gives the perfect balance of modelling, contrast and separation so nearly all shots benefit from a bit of help (usually bounced flash). The shot that you’ve posted looks murky, like someone has dipped it in a cup of coffee. For toning, try and be more subtle, maybe use the picture as the mask so as only to apply the toning to the dark areas and leave the whites clear.