Looking on the internet deeply has found these results:

I have a look is the most popular phrase on the web.

having had a look 1513,000 results on the web	I have a look 1195,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It's worth having a look at. Just having a look, boss. Political groups: Having had a look at some of the issues for the coming year, we asked the leaders of the political groups in the Parliament what they thought were going to be the big issues of 2006. Just having a look The Legal Affairs Committee, having had a look at it last week, concluded that the same objection concerning the legal basis applies because there is still an attempt, under Article 37, to bring together agricultural and synthetic ethyl alcohol. Yes, just in the area having a look around. The Members having had a look at this problem carefully will certainly be interested in this.	May I have a look at some of your books? Could I have a look at her teeth? Can I have a look, darling? Might I have a look at my old bedroom? May I have a look at your sword? Can I have a look, darling? Can I have a look around? May I have a look at that bag, please?

having had a look

1513,000 results on the web

I have a look

1195,000,000 results on the web

More popular!

It's worth having a look at.
Just having a look, boss.
Political groups: Having had a look at some of the issues for the coming year, we asked the leaders of the political groups in the Parliament what they thought were going to be the big issues of 2006.
Just having a look
The Legal Affairs Committee, having had a look at it last week, concluded that the same objection concerning the legal basis applies because there is still an attempt, under Article 37, to bring together agricultural and synthetic ethyl alcohol.
Yes, just in the area having a look around.
The Members having had a look at this problem carefully will certainly be interested in this.