Hi Vivek,
"Beriosa" is russian for birch, so your tree is a beriosa!

!
Good choice BTW, the birch tree is extremely popular in Russia, with traditional songs composed for it!!
It is even more prominent in the north of Russia, where whole forests are birch!
The person who stated that a proper scaling down/up EXACTLY 35 times is a wise guy (seriously!) and perfectly right!
What IS important though, is the impression created with the viewer. Basically it MUST look right, that's all!
In real nature we tend to "accept" things as they are, because it's real...in a dio, anything "unusual" basically calls for a justification.
You avoid oddities....you don't have to justify anything. You do include them....better be prepared to show your sources of information.

Vladi from Bravo6 is a master at that game! Everytime someone voices doubts about parts of his figures, he immediately provides the photo he used as a reference...et voilą!!!

The only thing you have to learn is to watch everything very closely outside or/and spend a lot of time on the web. Fortunately there are photos of about everything in the Internet. You just have to find them!
Diorama-building is a constant and lifelong learning process! That's what makes it so fascinating IMHO!! You can be in that "business" your whole life, you'll never stop learning new things!!
So welcome to the wonderful universe of dioramas!!
Have fun!! and loads of it too!!!
And whenever you need something, don't hesitate to ask! There are lots of experts here on the forum that can help!
Cheers
Romain