Trunk is a bit big compared to the rest of the tree. Other than that it looks alright, you could try to add some variation between the layers of the leaves.
The trunk is way to big try scaling it down 
I like the tree. Looks low poly, but I think the trunk is a little big, but not by a lot.
Big trunk, you should scale down, but besides that its not too bad.
Although I don’t know about how the low poly tree and the realistic ground go together.
Looks good for a first blender tree, I would try adding more variance to the layers of the tree though.
A lot of people are complaining about the big trunk but i actually think it suits the tree! It looks good overal 
It looks great as your first tree made in Blender.
I think it looks very good! But maybe it is a bit too tall in my opinion!
But great job I like the model!
I think you should make it less tall, also, I think it’s too skinny as well.
I agree with @Aerosies. It’s too thin and tall, and you may want to consider moving it to the left a little, it’s leaning over a bit too much.