Actually, I'm not looking for complete makeover scenes. I'm looking for those scenes that sometimes happen in Shoujo mangas where the female lead gets a temporary makeover, maybe for a date or something?

Some examples of this are chapter 45 in Lovely Complex, chapter 41 of Kaichou wa Maid-sama, and chapter 25 of Kimi Ni Todoke.

So, that's all I'm looking for. So, if anyone knows a manga with a scene like that can you please let me know? And if possible, please tell me what chapter the scene is in?

Mairunovich

The girl gets a makeover at the beginning of the manga.

That's all I can think of right now...I'll add more when I remember.

Umi no Misaki an extra chapter "special love equation" (44.5)
Emma chapter 28,

Well, in Beauty Pop the female lead is the one who do the makeover to other girls (she's a hairdresser).

The female lead in Kuragehime got makeover, I think in earlier chapter, sorry I forgot which. But she gets it several times later too.

Also:
Kyou, Koi wo Hajimemasu: between chapter 2-7, I think
Paradise Kiss: studious girl become model, she gets makeover in earlier chapter
Yamato Nadeshiko Shichihenge: the makeover happened since volume 1, but she always back to her 'scary' appearance, so it happens several times too.
Yoru wa Betsu no Kao

Yume Miru Taiyou has one. I can't remember when, but it's a good manga so worth reading the whole thing

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Skip Beat definitely. It happens multiple times, though with different types of "makeovers" and it's always satisfying to see the shock everyone has when they see her. She actually looks different too, as opposed to other manga that just put hair up and add sparkles and say she's beautiful...

Ultra Maniac as well

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It's not until later in the series, but it's really good

Maybe The Knockout Makers? The series is about makeovers and image transformations

These suggestions are great! I'm actually currently reading Kuragehime and Mairunovich. I've already read Beauty Pop and I really enjoyed it. Thank you for the recommendations. If you guys have anymore, let me know!

Warau Kanoko-sama has one makeover scene somewhere in the middle of the series but it's for a supporting character. The main character tries to transform the girl's looks.

Cousin is a about a girl who wants to loose weight and she ends up looking different later on.

Bara no Tameni has a short make over scene as well.

And of course, I double-reccomend skip beat.

Some of these are more disguises than makeovers:

Hot Gimmick - v2 ch8, Hatsumi's sister makes her over for a date
Gokusen - couple of times -- Yankumi wears traditional dress (don't remember where); as a yakuza boss v11, ch46; later a yukata (v15 ch1)
The One - main character is a model, so lots of make-overs. Example: v1 ch4; v4 ch22
Tokyo Crazy Paradise - several places throughout, as she wears different disguises Example v5 ch 27
Suki ni Naru Made Matte, first story

That's all I got