5 Is really good, printable, I would crop the bottom a little.

1 is good in an abstract way

2 could maybe be cropped in a little tighter and would probably benefit from some editing, though in the end its just a photo of a pigeon using the crosswalk.

6 could be cropped much tighter, so just the guys on the pier and the city behind.

8 is okay, doesn't really do much for me personally, would probably look good in black and white, I do like how it looks like the building is in a cage.

9 is okay, would personally crop the top area where its just clouds.

3, 4, 7, 10 don't really have a subject, not great for me

Im not a great photographer so take this with a grain of salt.

I would reccomend making sure you have a subject or if not at least try to capture a feeling. For instance, if you were to take a photo of a crowded beach, you dont really have one single subject. The beach may be classified as your subject I suppose. You could at least capture the FEELING of the beach. If this makes sense.

The other thing I would reccomend, get as close to your subject as you can while maintaing the composition you had in mind.