Enlarging photographs is harder than it seems.
No, seriously, getting a section of a digital picture enlarged without introducing all sorts of photographic “noise” is far, far more difficult than you might suppose. When zooming in, the edges get jagged far more quickly than people realize, even when you’re using a fancy-dancy Canon 5D Mark II and shooting in RAW mode. (No, I don’t have one either, but I so, so am saving my nickels and dimes to get one!) So, what is a creative photographer to do? Simple, use SmillaEnlarger, free, opensource software available on Source Forge.