2 portraits from this weekend using 550D with 100mm 2.8 macro

My Aunt asked me if I would take some pics of my cousin at their barn and at the horse track. I told her im not experienced taking portraits but id give it a try. I brought the 50mm 1.8 and my 100mm 2.8 macro. I used the macro most of the time.

Here are my favorite 2

100mm
1/320
2.8
ISO100

100mm
1/500
2.8
ISO 400
+1/3 exp

Tips and comments are always welcome

Thanks for looking,
Mike