Hey Vivien,
Great job on both! Both are very expressive and nicely textured!!!
I just got back in to acrylics - they are a fun medium to work with ... especially because like Smkie said, when or if you make a mistake, you can go back over it. I like to put down a layer of colour, light or dark and work up from there, leaving the major highlights and shadows until last.
You've got a wonderful talent here! Keep up the good work!!