Thanks heaps for the critical comments guys, it all helps.
Melaquin:
It interesting that you note the lack of any 'hills' on the ground as when I was done this was also the first thing that bothered me. I thought I'd created a hill for the primary and secondary to sit on but once the others were added I realised it was all the same? I need to take more time in future while planting as I tend to hurry.
I did deliberately put the trees towards the back though creating negative space in the foreground for depth. I'm not sure I agree with your criticism there but I'll definately think about it.

And yes it's nine, an avoided number for some, but I plan to add more in future. As I said, it's a start. And I meant oval when I said 'round'. Sorry.
Thanks for the encouragement!
Pup:
Thanks for your comments.
So would you like to see more space in the middle of the group rather than at the front?
I really do wish they'd hurry up and grow.