Break Up - No Contact Rule?

Hi guys, so my boyfriend broke up with me 2.5 weeks ago but his feelings are still there.
So I went completely no contact since last Sunday, didn't reply to anything. (Before last Sunday we texted 3 times after the break up.

Today he texted me "nice new WhatsApp picture, your new hair color looks good."
So my question is: should I reply to that or leave it unanswered until mabey 1-2 days later?

Well my goal with the no contact Periode is to make him miss me and mabey get back together with him.
Thanks for your advice already.
Break Up - No Contact Rule?
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