First successful loaf!

Hi All!

This is my third loaf and the first one that actually worked. Any improvements that could be seen? I’m not experienced enough to know what isn’t right if anything isn’t but given it’s only the third attempt I assume I can still definitely improve. I followed a recipe but given timings and everything else I’ve written down exactly what I did. Noticed it seems less holey in the middle and the bigger holes are all closer to the edges (first pic). Any help would be greatly appreciated!!

• 150g starter
• 250g warm water
• 20g olive oil
• 500g bread flour
• 10g salt

Mixed starter oil and water with a fork, added flour, mixed to shaggy dough
Left for 40 mins, added salt, mixed a bit more for a few minutes, kneaded a bit
Left for 3 hrs stretched and folded twice in the last hour (I forgot before)
Shaped and put into banneton
Covered with cling film and a towel over the top left overnight for about 14ish hours
Turned oven on with tray inside to 245
Boiled water and placed into a loaf pan at bottom of oven
Put loaf on baking paper and onto tray in the oven for 5 minutes
Took loaf out and scored then put back in for 15
Lowered temp to 200 for the last 20 and removed the water.
Took it out of the oven for a few minutes and let the oven cool then put it back in with the door open because I heard that can keep it crispy which I was struggling with.