I always like to give good feedback that helps and here goes:
Most of your pics are very clears and look great, I notice though that one of two things happen in a few CLOSER UP IMAGES and that is focus problems.
This is likely something you may have missed in the book for the camera - most digital cameras have a focus feature that take a little getting use to - that is, you need to push the PICTURE TAKING BUTTON part way down and this locks the focus on a particular area in the cameras view finder (sometimes faces, or you may be aiming toward an object further back and wanting your focus to be sharp toward IT and not toward something in the near-ground.
So as you shoot the picture, hold the button down half way for a second or so - you will see and maybe hear some adjusting happening and then push it all the way in to SNAP the picture. This is very common in most digital cameras today.
The other thing is if you are taking pictures of things fairly close up, make sure that you are NOT using the zoom feature at all, the combination will cause a blurry pic too. You can stand further back and use the zoom fine and it works great, or stand at the MINIMAL DISTANCE recommended toward an object BUT MAKE SURE that your zooming is not slid toward any magnification.
These two things (and also making sure that at the time you snap the picture you brace the camera firmly and don't move your hands any) will almost guarantee a very sharp closer image every time, especially in low light conditions when the time the lens is open is longer. In older film cameras, the magic speed for handheld shooting was 1/60th of a second: if you were to take a picture where the lens was open THAT LONG OR LONGER your own heartbeat would cause the photo to blurr. So bright pictures will always have a faster shutter speed and that reduces motion blurr, shady or dark conditions where the FLASH will have to go off (I usually turn the flash to manual ON if I'm taking a lot of near dark or indoor pics) that way, I won't miss pics that have poor light, but did have enough light to NOT set off the flash in auto mode.
The best way to take a pic is to brace the camera so that when you push the button half way down to focus, you can continue to push it without the camera hopping a little, you want to take a photo like you shoot a gun, a smooth motion which you follow through with .
Take a look at your photos in the slideshow mode, set the speed about 1 second apart and you will easily see the similarities in the slightly out of focus pics. The above suggestions come from using many cameras and lots of practice - but honestly I think you are doing a great job and you only get better from here :)
Hope I helped some,