Hello, and welcome to the forum, I think this is the right place to come and enquire, you will generally get helpful and more importantly, constructive feedback. Your D5300 is a great camera to start with.
I think the photos are interesting enough without needing the editing you've applied - I'd like to see how they were before they were edited. I suspect they'd be more interesting and in my opinion, as long as it was taken right, then the more interesting the photo, the less editing it will need. But that's only my opinion. This is a very subjective game and what matters is what YOU like.
In order to provide us with further information which can help us to help you, it would be useful if you could let us know the following:
What camera did you own before buying your D5300?;
Did you edit those images in camera or with external software?; and
Are you self learning photography or going to external groups/classes?
With that camera you've got, it'd definitely be worth getting familiar with all of it's controls and understanding what they do, in particular shutter speed, iso and aperture. I think the in camera guides should help you greatly.