Welcome to the forum!

A pretty model hides a multitude of sins. Good choice! She didn't do too badly at all. To get her to pose the way you want you need to know what you want and tell her clearly. Communication is the key.
#1 - Your love of wide apertures suggests to me that you are overusing this. The focus point seems to be in her hair parting leaving the rest of her face not quite so sharp. I can't see any EXIF data so I can't say for sure what aperture you were using.
I Probably am overusing it then. I'll try to find the right balance next time! I seem to miss focus a lot. Could it have something to do with wearing glasses? It's hard getting my eye to the viewfinder without my glasses hitting my eye. Aperture was at f/4.8
#2 - You seem to have missed the focus here, too. I'm not sure where that went to. Also I think this would have been better shot in portrait orientation.
#3 - I like the setting and love the smile you captured. If you look at the pond on the right there's a plastic bottle or plastic bag floating in the water that could easily be cloned out. It's a pity you didn't leave a little room under her boots, that spoils the shot and as you cut off the soles it would be hard to fix that in post.
I didn't even notice that! Teaches me to show others my work first as they notice things I didn't. Guess I gotta work on my framing as well!
I'll leave others to make suggestions about lenses but I'd say that you need to work on sharpness with what you have. A good sharp image of your subject is basic. Don't be afraid of criticism, here. It's usually meant positively and I have learned most of what I know about photography from having my photos ripped to shreds on this forum!
P.S. EXIF date is embedded into your digital image by the camera. I'm not familiar with yours but you should be able to set the camera to include it in the main menu.
It seems the EXIF data is included with the photo. Guess the metadata gets lost through imgur?