Photography - Learning manual mode part 2

Last weekend my bf and I went out for a walk with their dog, Finnman.
He's a deerhound and the biggest dog I have ever seen upclose.
Our walk went to the shore of a river nearby. It turned out to be a very nice afternoon with very pretty light.Perfect for taking out my camera and try the manual mode!
Plus, walking with Finnman, I had a good challenge to get a nice picture from a very lively model. Here are some of the pictures. Please remember I'm only practising, so if you have some advice, let me know in the comments below!

 f/4, 1/800, ISO 160, 18 mm

f/5.6, 1/640, ISO 160, 42 mm

f/5.6, 1/800, ISO 160, 42 mm

f/5.6, 1/200, ISO 160, 42 mm

Have a nice day!
~ Riechan