I like both photos, generally speaking, and your girlfriend is very photogenic. I'd like to offer the following bits of constructive criticism...
In the first photo, there is way too much backlight, especially since your girlfriend seems to be sitting in the shade. I know you are waiting on your speedlight and softbox, but in the meantime, try the same shot about an hour before sunset. If the sun is behind her, you can try reflecting the natural light available onto your girlfriend's skin. If you don't have a reflector, then anything large, flat, white, and reflective will work in a pinch... I've always found that styrofoam does the trick nicely if you can get your hands on it. With the right reflective angle, you can add a nice bit of brightness and glow to your subject's skin and hair. You can also try spot metering on her skin... The background might get blown out, but at least your girlfriend's skin will be properly metered. Speaking of skin, be careful of skin tone when shooting in the shade... The skin can take on a tone of the nearest reflective surface... In the case of photo 1, the wooden deck (and perhaps the pinkish/purplish dress) has cast a bluish tint to your girlfriend's skin... If you don't see it immediately, compare her skin tone from photo 1 (bluish) to photo 2 (quite nice and natural). If you have not yet learned how to set custom white balance with a grey/white card, it would be a great thing for you to discover. With the proper custom white balance, your photo, and most importantly, your girlfriend's skin, will have a very natural and neutral hue. You'll then have a clean canvas to work with if you want to add warmth in post production. I have one more thing to say about photo 1... I think the framing is a little bit off... Your girlfriend's pose is very nice and natural, and her legs drew my eyes to the lower left of the photo... That's good... What's not so good, in my humble opinion, is the extra dead space on the right of the photo.
Photo 2 is nice... It's very nice, in fact. I agree with Murklemark's about the train tracks and the cut-off legs, but all in all, it's a very nice photo. Just a thought... One of your girlfriend's most striking features is her hair. You might consider casting some light on it to bring out more highlights and shine.
Thanks for sharing!