Hmmm. What could be added?
I wonder what you mean by "this kind of photography"? What kind of photography is "this"? You mean nature?
What do you photograph with?
Are you working in AUTO mode, so far only just trying to compose something out of the big whole that we see with our eyes and first of all letting the camera do the rest for you?
If this is the case, do keep in mind that the camera needs oodles of light when you zoom in on things (like I assume you did on the bird in the last photo, and maybe also on the gulls in the first?), so that, when in AUTO, it will automatically (without you noticing) up the shutter speed, i.e. require longer shutter speeds than you can possible hold without getting camera shake.
If you zoom, try to avoid at all costs to zoom into the "digital zoom" area. The quality of your photos will drop rapidly with that, as the camera is no longer actually zooming, but creating a crop out of a photo that would normally look a lot less zoomed.
Do you work any further on your images once you have loaded them onto your computer with whichever sort of software? That might help correct colours that went wrong, it may help up contrasts and colour saturation, and in some case a mild sharpening might help you get a sharper picture. Though no sharpening will save neither Photo 1 nor 4.