I have been working on a lobby for a guy, and I like the results but I would like to get some constructive criticism on this to see what I could do better 
(Btw I know I got to fix the trees, they were put there just so I could see how that would look from the player’s point of view)
[Edit]: Almost everyone complained about the handrail, Do not worry, I have already addressed that 
Looks cool! I would suggest playing around with the lighting a bit though.
Handrails needs more thickness. One the biggest mistakes I see builders make is not making parts that are way to thin to make sense. Like thats basically a piece of plywood that would fall over on the first time wind came through the hill. Im not saying that everything has to make sense, but it helps a lot for simple things to seem more realistic.
More trees and stuff to flesh out the area. Especially on the mountain.
The wood grain is bad.
Starting off with the railing on the staircase, the lighter brown trim is incorrect. The upwards facing face should have the wood grain oriented so it goes along the length of the wood, basically so the straight lines follow the arrows I added to the image. Same with the vertical sections of the lighter trim; those pieces should be vertical.
Also, for realism the path itself should be wooden planks, not wood, since you would need one massive piece of wood to make the entire path out of one board, while wooden planks automatically breaks up the path into smaller pieces of wood.
Other issues can be seen on the tents and map posts. Being as both of these are posts, they should have vertical wood grain so that the lines of the grain extend from the ground to the top of the part.
I feel like there are more issues I could address with the houses, but the resolution is a bit too poor to be able to see the grain properly from the screenshots provided.
Different sized trees would be nice, maybe change up the leaf patterns aswell
Looks nice but I recommend invisible walls and a small max zoom distance unless you are going to fill in extraneous details beyond the player perspective (mountain details; trees, easter eggs, etc)
Also it’s a bit small, and the (current) places where players can walk through is linear. I imagine someone in the lobby would probably leave if they had to wait for more than about 45 seconds.
Looks neat so far!
I’d recommend (in the second image) varying the height a little more on the extended cliff on the right side. Right now it just looks like a simple terrain brush over an area.
And like Drager said, unless you’re going to add more (good) clutter/details to the rest of the sort of island, it’d be a good idea to add some sort of fog, invisible walls, and a small zoom distance so that players won’t see miles of empty space.
If you do plan on adding just a little bit of fog, one tip I’d give is to add some larger clutter in the far away parts of the island (or even off the island) so that the fog actually has something to hide. That sounds a bit weird, but with Roblox fog, if there’s only sky in the background, the fog has nothing to “reflect” off of so the sky will just appear slightly tinted towards the color of the fog rather than actually fogging up the area behind the set distance.
Nice terrain, the handrail throws me off. Try making it more thick.
Also, the long cliff on the right side of the second image, looks too unnatural. I would suggest adding some hills or taller cliffs behind it.
I plan to add a cave with a lot more space for players to walk around
Could i give constructive criticism on the way you wrote that title?
No.
