Sometimes it is a bit confusing to recognize which part belongs to which post.

I think that the distances within a post should be smaller and that there should be a dividing line between them.

Posts that contain tall photos are also very long, and the image can't usually be viewed in its entirety without clicking on it.

You could optionally post images in a square format (with a border on the sides, similar to Instagram) and make them enlarge by a click.