@ Sure: you are using very strong colours in your buildings, and I love them.
The buildings are rather huge, which does not have to be a problem, but as their froms are all rather "square" (we call that "blocky" in RCT, ) it soon looks boring. I can see that you put in a lot of effort to place details on the buildings, but I advise you to also vary with the forms of the buildings themselves, to make them more interesting.
Same goes for the straight and huge waterfalls.
Like you said, you are a beginner, and will improve on the way, just by trying.
It looks very promising now already
Lucas already gave you a link to nice parks to learn from. I would advise you also to download some of the excellent VP's (= Vacation Parks) from our VP-section.
They all will give you new scenery you might be looking for, as well as ideas how to also make larger buildings look interesting.
Mind you that you can only use this new scenery when you start a new scenario, or when you take the current park back to the scenario-editor. (I think you have not yet built any rides in this one, so that does not have to be problem).
If you want to import new scenery into a park without going back to the scenario-editor (because you are losing your built rides then), there are also possibilities to import new scenery into your game. (give a call when you need that)
keep going and having a lot of fun with it
@
to all the ones using/practising their French in this thread 
: it's really lovely to be able to speak your own language here, or excersising your second/third etc. on here. I know. (was tempted to throw in my French also, but that would be contradicting myself.....)
Nothing against it to do that incidentally either, but please remember this is an international site, and as we agreed on English upon the language, writing in another one means that many people cannot understand what it's going about, so they cannot react/contribute (at the best), or will feel excluded (at the worst).
Doing this also bypasses the goal of a site like this, which is sharing with and helping from each other.
So, if you want to exchange things in another language, more than a word or two, please add a translation of the main body of the reply, or use pm's.
Merci beaucoup et thanks for your understanding.
Emergo