i dont think there was any missed focus on #1. i dont know what the aperture was for these shots, or how far away from the subject you were, but it could be a DOF issue.
in #2 i think it might be a camera movement issue...too show a shutter speed. could be what happened in #3 as well.
for these, i would have shot with a faster SS and more DOF. maybe f/5.6 or so.
i think the white balance is off with all of these... that
could just be the color of your walls, but her skin looked red tinty in LR.
i took a stab at these. i didnt want to mess with cloning or healing or anything like that...just a few minor tweaks to suit how I would edit them.
this shot is fine for a shoulder/head shot. (fly away hairs aside) theres really nothing terribly wrong with this one.
i think this was probably shot between f/1.8 and f/2.8 and you just needed more DOF since im guessing you were standing pretty close.
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focus issues here. it looks like her knees are in focus. i love the concept, but i would reshoot this one. i straightened this one out a bit as well as WB.
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a little straightening done here too. i really like this shot. its a great horizontal portrait.
honestly, there arent any glaring focus issues here. this shot is fine as well for web viewing or even prints 11x14 or less.
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overall, you have the right idea. get monitor calibrating tools. I use colormunki display. not terribly expensive.
there could be backfocusing issues...and if your shooting at f/1.8 or something like that, it makes focusing more difficult.
also, even if your using a good tripod, remember that people dont always hold perfectly still so make sure your shutter speed is high enough to compensate for small movements in your subjects.
i like a decent DOF in my portraits. I dont like portraits where the face is in focus, but you lose focus by the time you get around to the ears....so im always shooting at f/4 or higher, and rarely under a shutter speed of 1/160th.
in my opinion, #1 and #3 are fine for web viewing and small prints.