An amazing image for a first go at it. I wish my first goes at it looked anything like that!
Try 20 x 4 minutes or even 5 minute subexposures, perhaps even longer depending on how much light pollution you face. The darker the skies
the longer the subexposures with a DSLR. You are limited by light pollution (called sky fog in DSLR talk) to how long an exposure you can take
in suburban skies.
Longer total exposure is almost always better.
Greg.
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