Ok, so I'll tell you my opinion as a beginner-companion of travel on this path through photography.
I like photo n. 1. Because even if with some technical issues (green background a little confusing with the pine leaves), it tells me something. Let some emotions rise in my heart. It reminds me of nature, of beauty of life, of the movie E.T. and how few is the time I spend outdoor (and I would love to spend more). So, that's why IMHO it works as a photograph. It gives me some kind of emotion (positive or negative doesn't matter).
It tells me something.
For the same reason that's why (jmo) ther other pics doesn't work as good. They don't tell me anything. They don't give me emotion. I think it's important to understand technical rules (exposure, composition, etc), but it's important because they're the language to say something. But you must want to tell something.
N. 2 has a weak/not so interesting subject.
N. 3 and 4 are almost meaningless to me. Do you agree without getting offended if I say that seems that you shooted them randomly on the ground (most of my shots seem so, randomly taken, that's why I dare to say that

) ? Do they deliver to you the same emotion of n. 1? I don't think so.
So the MAIN issue in photography, to me, is
having something to say.
You can be a master in grammar, but that doesn't automatically transform you in J.R.R. Tolkien.
So knowing the technical rules of photography is a must, but that doesn't automatically makes you Robert Capa.
The first thing is
having something to say with your shoot and then
learning how to say it with the language of photography.
It's been prooven through years and years that almost everything can be said with photography.
Love. Sadness. War. Cruelty. Age. Tenderness. The sex appeal of a model or the beauty of a sunset. It's up to you. Scan your soul for what would you love to say with your shot and then take the camera and have fun.
I'm sure you'll get a lot of n. 1s and les and less 2,3 and 4s.
Can't wait to see your next shots.