I only have a basic knowledge of portraiture so the only thing I noticed in #1 photo was the gross distortion I would have said came from using too wide a lens and coming in close ... that you say you used a 165 makes it all very strange. It might have been comfortable for the young lady but definitely not a good thing to pose like that.
You seem to have come a long way since then but except for #44 the subjects are all looking at the camera ... then in #44 the interesting parts of the face [ eyes,nose,mouth ] are just a small part of the picture and we are faced with an large and uninteresting cheek.
My tuppence worth
A little tiip I know from way back ... get your subject to lick their lips
Sunbounce produces another solution that utilizes a bracket. It will appeal to photographers who are accustomed to finding a wall and bouncing the flash, but for one reason or another (colored walls, high or black ceilings, outdoors) cannot find a suitable wall. Instead of moving the flash away from the camera, it places a reflector card off camera. It's called a bounce wall, and their model has a clever ball head that allows one to quickly position the "wall" for best effect. Unfortunately, it's expensive at 99 euros/125 dollars.
I rigged up a presentable (this is more important to clients and potential clients than some realize) DIY version using the Stroboframe and easily available clamps and bolts. You can find details on my blog here.
I am a studio beast, but that is all the more reason that I hate not having all the tools in my arsenal (Gary Fong, Rogue, reflectors, etc.) to mitigate the limitations of on-camera flash. A rogue grid, lightsphere, and DIY bounce wall all fit in a very small space.
It's as important to use your wits as your gear, though. Art Wolfe simply asks someone with a white or black shirt to stand where he needs them.
Victor - all your photos have disappeared, at least for me !
So sorry folks.
It's not your set.
Please check later on while we make some minor adjustments.
Meanwhile, we return you to you regular programs.
Thank you for your kind consideration.