Mike,
Sorry for the delay. These are busy months of the year.
Take this critique and suggestions, and apply them to your next set of images. Give yourself an assignment and a subject. They are a starting point. There are many options with each of your images. Thank you for posting them, they are better than the typical snap shot; but they leave room for suggestions. Very useful here.
The basics of this shot are well done. Side lighting on the seagull, gull is on the right third's line and looking into the open part of the image frame. I like the diagonal cable/chain. The image might be improved with the use of a polarizer, cutting reflection on water, and showing more detail in the feathers.
The composition is good in this shot. It may or may not look better, without the building behind the statue. The cross lighting is a good idea. With this statue, the lighting will be completely dependent on the weather, and solar cycle.
Try this one again and consider her to be posing for you. Place the camera more in front of her face (camera-left in this image), and be there when the sunlight is shining across her chest, and not straight into her chest (good for men, bad for women). This shot is highly dependent on the time of day. Get up higher, if you can (may not be possible). Maybe you could find out how often they scrub the pidgin poo off the statue. The poo does not make her look good.
Statue in front of San Diego Admin building
This seems a bit flat in contrast and texture. If you have photo editing software, try boosting the contrast. Not much to do with this image, unless you want to narrow down the subject, and use more dramatic lighting.
Mosaic at the bottom of statue
You are right. It is centered, and that usually does not look as good as it can. That applies here also.
Zoom in a little, step further to the left, and place the flower in the frame (left side), so that it is looking across to the other side of the frame.
Flower, I know it is centered and shouldn't be but the area to the side was kind of crappy looking.