In the coming days I will start a topic with tips, tricks & how to's regarding TG techniques and principles which may help others with the contest.
There's really a lot of things you can depict as Icelandic landscape so I suggest you browse the Pinterest board once or twice and pick 2 or 3 which you think are suitable to be made within TG.
It's your choice to do a photo reproduction or an interpretation of your reference(s).
Luckily you started already so you have way plenty of time.
I know you a little bit as a person and you like to do dozens of different things a day (right?) so for you it might be handy to pick a type of landscape, dive into it and iterate every day after 1 or 2 hours of developing it.
This way you're starting fresh every day and others can give you suggestions. Perhaps this is good general advise anyway.
I'm looking forward to see your next iteration then
You can also post references of what you're after of course