Very nice, thanks for sharing and since you wanted opinions, here is mine:
The first one with the girl, her head/face seems a bit high, like an inch or so the lines around her neck make her look a bit too masculine, kind of like a muscular man.
Her shoulder also seems a bit off, her arm/bicep line is too close to her breast. The dress' shoulder strap should make you see what I mean.
The second picture is nice but seems a bit elementary for a college student (the trees in the middle, the river and the road/path from the castle. Everything looks a bit synthetic if you know what I mean. Almost like a mini golf course. Oddities: where the river runs (on the right hand side)? Same with the road going down from the castle? It looks more like it is going down than going away. I guess, you will need to use some shading to capture the distancing a bit. Also colors in the second picture seems a bit incoherent part vivid part sullen.
I hope you don't get mad, just throwing my constructive criticism at you, take it with a grain of salt please.
Keep up the good work!