'Un ovale' is correct but being mislabelled as incorrect

Question

According to Le Robert and Larousse (Word Reference too) the French noun for the English 'oval' is «ovale» (masculine). The lesson is currently miscorrecting this to 'oval'. Also, I understand that not all acceptable answers can be included but «lèvres minces» is the first option given by Le Robert, and the phrase my French wife would have used on first thought ahead of «lèvres fines» - is it difficult to add this as an acceptable option at the very least?

Accepted Answer

Re-bonjour Maarten !
Indeed, "lèvres minces" is perfectly acceptable, though I myself would not have thought of using it. It's marked correct as well :) 
Bonne journée !

Answer

Indeed, here I must admit to a very unfortunate "anglicisme" :(Thanks to your comments, it's now been rectified.Merci beaucoup pour vos commentaires :)

Answer

No problems Aurelie - my wife is French and she would have done the same, but as an 'australianisme'