Art 214- Collage WIP

This is my WIP for our most recent assignment. I'm using Pinterest as my primary source for gathering photos. I'm doing a water and land scene, using various works of art within my collage to create my desired effect. It's coming together pretty well, though i'm unsure as to what the sky should be. Everything I do makes the collage feel too busy and crowded, but I also don't want to do a basic blue sky. I was also thinking about adding a grainy texture on top of the entire collage to hopefully unify the piece together much more than it already is. I'm using primarily earth tones in my work, as well as cooler blues. Overall I really like the way this piece is coming out, I just hope i've changed the original source materials enough so it isn't considered plagiarism.