I found the bleeding heart (#15) to be the most striking image in the 'shape' category.
This fit more on the shape side of this week's theme. Definitely an evocative photo. I like how a small depth of field has added dimension to it by making the flower as sharp as possible while having a consistent background that adds value to the flower. The fact that the flower - pink (magenta) - and the background - green - are complimentary colours makes this pop even more. Adding more space around the cropping of the flower would be interesting to see.
The bright colours of the flower enhance the shape and the line of the lovely image. The image “pops”: the flower rests in a blurred complementary colour background and as a result the shape of the image is provocative.
This one caught my eye as it seemed like a petroglyph of sorts and I didn't need the descriptor "Mythical Animal" to see it. Abstract but realistic at the same time.
The way the image is framed by the photographer invites the viewer to follow the natural lines embedded in the tree. Details are clear and shapes created by nature, recorded by the photographer, inspire the imagination.
I found the "Leader & Sweep" to be effective as an example of line in an image.