Composition exercises

This paintings were made to work on composition and try different types of compositions. I had a hard time with the triangular composition and the cross composition. If you have any advices, I would love to hear them ;)

Woman jumping above a tree, circular composition

Hidding from T-Rex, triangular composition

Kidnapping the girl from danger, composition in cross

Looking at the sunset, composition in L

Hold your mouth shut, radial composition around the mouth