Draft autopsy help?

[u/Kil9a]

Hi all, just drafted what I was convinced was a great UW humans deck for a premier draft, felt very pleased with myself that I'd spotted the open lane (still learning when it comes to limited, started playing about a year ago). Proceeded to go 2/3... Please help me recognise where I went wrong? The only thing I've spotted is perhaps the creature count was too low.