Well, for WIP screens the ingame menü bars etc. aren't a big deal.
But for presentation later on, i would recommend to use the cheat for clearing the picture before the screenshot.
If you stuck somewhere i would do a step backwards and think about what is your plan of the whole park. Which kind of park you will go for?
Park building is a planning process first. It starts with an idea in your head and some parts can be done more/less without general planning. But if the park/project getting bigger, a solid plan is helpful to provid you from future trouble.
So sit down, take pen/paper out and do some brainstorming about your park in general.
This helps you along the way. And if you stuck again, take a look at your paper or notepad file.
Normally you have so much work to do on a park, that you normally won't get stuck
Also, i wouldn't use to much pre-build structures from other people.
Doesn't matter if they are good or not.
But pre-build ones won't fit anytime, especially if it comes to custom parks.
I would use these only as inspiration and/r rework it so that they fit more into your park.
Another hint would be, to start up with a small park for your first project.
A handful flatrides and 1-3 coasters are enough.
Major problems on big parks are the huge space that is left if you build allready a lot of rides and than people loose the interest into the project.
And the first one doens't need to be perfect. It can be seen as training.
The second park will be the improving your skills one. And so on.
So don't be to serious on your first park project and take it the easy way
It's a bit hard to give feedback on this early stage of process i would say.
But i wouldn't place trees first and also won't do terraforming without any purpose/reason.
You have an Entrance and a small plaza with your "sculpture". Now you should plan your path layout.
Use a sand terrainpaint or anything else than green and mark your future pathways.
With doing this you can better plan which rides should be placed where.
After doing this, you can do a rough terraforming if you want some height levels in your park.
But for the first park, a flatland will do the job.
Random foliage and other stuff is something for the finishing process.
So long, Cobra