Looking seductively at someone

Anne Heche to Harrison Ford: Oh, don't give me that, you were ogling.

1-ogle, look at with amorously (vocabulay.com)

2-give the glad eye, look seductively at someone (vocabulay.com)

The suggestions ogle and leer both have quite negative connotations, and they're motivated more by expressing desire than the intent to seduce. Suggestions I have are simply using "seductive gaze", "sultry gaze", or "flirtateous look."

Macmillan states that to eye someone is "to look at someone in a way that shows you are sexually attracted to them."

Note that Macmillan tags this usage as AMERICAN; it's likely a shortened form of the more common make eyes at someone.

You could call it a come-hither look.

In Gilbert and Sullivan’s Ruddigore, the melodramatic madwoman blames her condition on her having been seduced and abandoned by the melodramatic villain or “bad baronet”; and she describes the former operation as having been effected by means of “an Italian glance.” (The libretto thereupon calls for her to demonstrate, mightily puzzling many a mezzo.) A little less recherché, perhaps, but rather specific to a woman’s seducing a man, is the phrase to bat one’s eyelashes.