There is no specific shape :)
There,s no specific shape dont find it don't go into the political borders, look at the different types of land formations - mountains, rivers, coastlines, deserts, etc. What is the difference between the highest and lowest points? How do they vary from sea level? 
What are the temperature ranges of the continent? (eg. in the Gobi Desert compared to up in the northern part of Russia) 
Is it a changing continent (eg. Australia is in the middle of a tectonic plate so it has few major geographical changes, Asia sits on a few plates - what is the effect of that? hint. Everest is always changing) 
Hope it helps, and have fun.
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