Congratulations to your new camera. Did you get yourself a post processing programme along with it? Maybe the one that came with the CD that accompanied the camera in the box? That would be a start. You'll find that many people here use Photoshop for their pp-work, or The Gimp, which apparently is free and downloadable.
These are nicely done, you're apparently enjoying the shallow DOF (depth of field) you can acquire by using a wide open aperture, and it sets your subject well off the backgrounds. Good for flower photography, for example.
You say your photos are OK to edit, and at least the first three shouted at me "Please edit us", so I listened

. I hope you don't mind.
For in the case of your dog's photo, I feel the colour balance is not quite right (I don't necessarily feel it is over-saturated, like Sam does, but it is too "cool" with regards to colour temperatures -> too much blue in there). And it slants to the right somewhat, as you can see in the ripples on the water. So I adjusted all that.
I tried to get his face more out of the centre, but nothing I tried worked, so I left things at that:
The second photo was a keen attempt, but it failed, I should say. You best not photograph this directly into the sun (including it into your frame like you did), least of all when it is still that high up in the sky and that bright. It may for once damage your eyes, it may not be good for the sensor, and the outcome is certainly not guaranteed to be good. Backlit plants are a wonderful sight, but you best leave the sun out of it (unless it is very, very low, shortly before setting or shortly after rising, and unless you use a very small aperture, which might lead to your having to use a surprisingly long shutter speed...).
I thought that maybe the lefthand side of the photo could be cut off and rescued, but I don't think I did rescue it...
Now the third looks a bit pale, and I already thought the histogramme (that's the little mountain you can see) would show very little "elevation" on the left, i.e. the "shadows" side. Which it didn't.
So I simply upped the shadows a tad, and lowered the midtones a smidge, and there you are (same pic as the one immediately above, without the histogramme added):
I did wonder about how composition could be made a little better in post, but did not come up with anything really good ... though as it is, this photo is a bit unbalanced with everything going on on the right (there is your subject and your focus, and it's good that it is not smack in the middle!!!), but it feels too strong on the right.
If maybe a BEE had come to your aid, but it didn't... sigh

.
Spring is a lot farther advanced where you are than it is here.....!