Yes, because curls soften your features, whereas as straight hair make your features seem harsher like Rudee said. I have a long face and large nose, and if I wear my hair straight it will make my nose appear even larger and my face even longer. I am nineteen, and I haven't noticed if I look younger or older if I wear my hair curly or straight, but I definitely think straight hair makes my features look harsher and heightened, whereas curls make me look softer.
Unsure about density
Confused about porosity

Co-wash/condition: Alberto VO5 Moisture Milks

Leave-in: Giovanni Direct Leave-in Conditioner

Styling product: Clairol Herbal Essences Totally Twisted Curl-Boosting Mousse