That's not a sufficient reason to resubmit so soon.
Why?
If everyone on Hacker News submitted their website every few weeks to highlight minor improvements, /new would be unusable. :P
Submitting a website that offers no new insight to what has already hit the front page on HN is not constructive.
Apparently it's an online gallery, showing only one artwork every few days (week?). It amuses me, that you use the term 'minor improvement‘ when they swap exhibitions. I assume some would also consider this a new insight.