Hi Becky,
I'll work through these one at a time for you. I may not get through them all tonight, but I'll see how I go.
First up ...
As you've posted these at a quite low resolution, some of the processing (like sharpening) may be a little "sub-optimal".
In the first, I've reduced the saturation about 30%, but increased the vibrance about 30%. Vibrance is supposed to leave skintones alone - which it does, but only to a point. Often it'll have a minimal effect on the skin, with the exception of the lips (it'll give a touch of "lip stick", which is usually a good thing). You'll see here that the skin is now considerably less saturated, and the vegetation as well. You could hand saturate the vegetation for a "lusher" look, but then the lady won't "pop" as much, so it's very much a compromise.
I've reversed your standard vignette; a vignette is usually a good thing in this type of shot, but my personal preference is got something that's applied more "subliminally", and over a greater area (which I've done).
I've given it a slight crop (too much space above the head is a common mistake), and cloned out a few distracting highlights.
Usually with this kind of shot I'll dial in 1 to 1.5 stops of negative EC (ie "under-expose the background slightly"), and let the flash expose the foreground normally; it tends to raise the saturation of the shrubbery without making them too bright, but still lets the subject "pop".
Hope you like
Next Up ...
With this image I've done the same as the above one with the vignette, but mostly I've just tweaked the levels very subtly.
Quick lesson on levels and clipping points ...
Most images have something that's pure black and something that's pure white -- if they're not captured that way at the time then we "make it so" in post processing. If the image doesn't have these two characteristics then it may be referred to as looking somewhat "flat", and it'll appear to have a slight greyness to it. It's something you may be able to see (or may not just yet) ... you'll definately "get an eye for it" after a while. Now - just because an image has "something black" and "something white" doesn't mean that it won't look flat; it still can because the black and white areas can be too small for the eye to register them properly, so what the black clipping point adjustment (or "blacks" slider) does is takes values that are more and more grey and force them to black, and scale all the other down accordingly giving the image more contrast.
Probably the best way to see what it does is take a slightly over-exposed image and then move the blacks slider progressively to the right and watch what happens to the shadow and midtone areas of the image.
Next Up ...
Just more levels stuff ... brightening up the subject, and removing the blown area at the top.
Next please ...
More minor tweaks ...
- Brightened eyes
- Removed distractions
- De-emphasized dimple
I won't worry about the last image ... not a lot that I can add that I haven't covered with the above anyway.
Probably what I should say though is "If you've shot these before your first photography class" then I'd have to ask if you're the student or the teacher! Honestly, very little wrong with these in terms of the capturing; if these were shot RAW then I could clean them up - print them on canvas - spray them - and present them to a client as a professional job no problems what so ever.
Honestly, the technical side we can teach anyone - but posing and composition is something that's 100 times easier if you have a "creative disposition" towards that kind of thing; I don't, but from what we've seen here, you do ... and I think it'll take you a long way.
Well done