When I enlarge a character to anything over 200%, I do the following.
1. Get to the size I want it on BannedStory, or if I want it bigger put it at the biggest.
2. I bring it to photoshop, but i think this also works on paint.net, and if it isn't get it the size i want.
3. Blur features such as the hair, clothes, and possible face. Try to avoid eyes cause they should be sharp.
Final Result: A smoother, more realistic character that is easier on the eyes.
If you want to be careful, you can start the blur on 25% or so, but I use 100%.
An example of this is the hair of the two noobs in link
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