Bottom 3 Photos

This is an unsuccessful photo because there really is no subject, the frame is poorly tilted, and it is cluttered in a bad way. It uses no photography techniques.

This is an unsuccessful photo because the background is cluttered and the subject is unclear. The bottle looks like it is floating since the foreground isn't lit properly.

This is an unsuccessful photo because it is blurry, and the background is clearly visible next to the backdrop which significantly distracts from the subject.

Top 3 Photos

This is a successful portrait because the light highlights half of his face and some of his hoodie to emphasize it and create a certain mood, and it uses rule of thirds 

This is a successful seascape because it has a muted grey color palette, and the light on the water creates a reflection with leading lines towards the horizon of the photo.

This is a successful cityscape because it avoids bad mergers (other buildings), and highlights the silhouette  of the city against the light blue sky in the background

Photoshop - Blur

Photoshop - Filter

Photoshop - Grayscale

Photoshop - Liquify

Photoshop - Levels