Catchlight in her eyes.

Thanks Ginnypenny for the diagram positioning the catchlight. I have to agree with you that a dead-on-center of the eye catchlight looks odd. Now that I am aware of it, it bugs me when I see it. It is one of those many subtile things that make a difference in the engaging aspect of the subjects eyes. I have had many good and helpful critiques in the last few days and I appreciate them a lot. I have a list of improvements and lighting techniques I am looking forward to using at my next shoot. I posted this image of Oksana to show the difference it makes when the catchlight is positioned away from the center of the pupil. This eye reflection was added in PS to an image that had a centered catchlight. To see Ginnypenny's diagram of a catchlight look at topic "New poster".

Mike is right about the catchlight, however, I have changed catchlights in PS occassionally.  Usually, like I said before, I just clone out the second one, but I have also moved them, or even copied one from one eye to the other if the second one is missing or not as bright, although you have to be careful doing that, if the eye is in shadow it will look odd to have a catchlight.
I have never had luck just adding one with a paint brush, they don't look real to me.

Ginnypenny: Here is Kate with catchlights and more contrast. As I look at this image I still feel that it is somewhat flat. There are no shadows on the face to sculpt the form. It is a more relaxed pose, eyes are more alive, less red in terms of skin tones. Again, help me here. I probably will not post until a do another shoot and use all of your and Mike's suggestions. All day shoot on Saturday with a pro MUA. I'll see how it gos with the butterfly lighting, again a higher positioning of light source will help me. I am wide open for suggestions.

Yes, just practice, a lot.  Butterfly lighting is not perfect for everyone.  I do use it a lot and my makeup artist knows this and will use makeup to and a little contouring to the face.
I have found that butterfly lighting works really well with a harder light source (move your light back) and that modified loop lighting works better with softer light (use a modifier like a soft box and move it as close to their face as possible).  However as you are practicing you might want to use a soft light source for both, it's more forgiving.

Ginnypenny: This lighting thing is a monster! I have been shooting with a tungsten light through an umbrella or bounced from inside the umbrella and filled with a flood or white reflector. I would like to try a soft box, I have never used one. I see I need to start experimenting more. I can see my work improve though so that is good. I'll try the butterfly lighting in several light positions, thanks. I will also try a white reflector as well as a silver one. Right now I don't even know what loop lighting is. Thank you for your valuable comments.

Ginnypenny: Thanks for the info I will check it out. Modeling light... good. Had a good shoot yesterday with Oksana, she wore a white dress outside in the sun. I have a lot of overexposed shots even though I used all kind of settings. I do have a few in shade that are very good I will share when I can. My strobe light slave arrives on the 27th, then more stuff to learn about strobe lighting.

Blush.  ( Make a recommendation please. C'mon now don't laugh.

ummmmm.... I don't remember the brand I have, my husband would know.
I think it may be a Sekonic.

They aren't cheap, but they will help you measure your light from your flash, from the sun, whatever.  Then you can start balancing them.  You will need to learn light ratios.  I like using ratios that aren't harsh.  For example, let's say using your meter you get the sun at 5.6 by adjusting your shutter speed.  Then you could set your light to an f-stop of 8.  Then you have a 2:1 ratio with the electric light as your main and the sun as your fill.  Does this make any sense?  Am I going to deep?  The point I am trying to make is that once you get a light meter you have control.  Learning light ratios and patterns isn't exactly a cake walk, but it's not super hard and once you get the hang of the basics you can work on those until you master it (which I dare say 99% of photographers are still trying to do).  For example, I have only had a light meter for just over a year (when I put together my own studio) and I don't know how in the world I was shooting for so long before that.