Personally i think that its not bad making similar thing as other mappers, i mean.. i take inspiration from other mappers all the time.
Mackan, Shirako, Neon, blackstone, ghost and more. if you like how it look then why not make it yourself? maybe not copy it right off but even if it is similar you will unconsciously put your own touch on it, atleast thats how it is for me, like that frost cave entrance i made some time ago, cave entrance is pretty much rip off from a piece neon did years ago but the surroundings is not similar at all..
I for one wouldn't mind if you pretty much copy my maps, if you copy them it means you like them and i see that as a good thing.
taking inspiration and "copy" others work may get you to get an idea and then it turns out the end result is not even close to the picture that made you think of it.
the points Kaspar made is great feedback i must say, and you (and all other mappers) should actually take time to really learn making great waterfalls, it comes in handy in so many ways, a good waterfall can make that little extra and make any map pop.
great work tho, its nice to see some updates from ya mate! keep em comming!