Outdoor pictures are OK but those portraits really not good.

Really headache with all those Wiralution and now Wira GTR? WTF??!!

Colors a bit too warm. Try to look for other background as the camera is focusing more on the background than the subject. Do remember that AF looks for vertical lines as reference. The more vertical lines you have, the faster it will focus... on them.

Out of the lot, #9 has the best composition and focus but her top part of the hair are cut off. Should include all the hair into the frame. There are some distracting things behind her, a chair or table maybe. Should remove them.

And with ac98's advise, the 50mm f1.8 is not sharpest at widest but at 1 or 2 stops smaller.