Yesterday, I did pink nails on -->at the nail salon in Japan. 

The theme was --> is "Valentine's day," on my new nails.
There is pink and glitter holograms on my new nails.
I love my new nails.

私は本当にあなたの爪を好き!彼らはかわいいです。^^

MY NAIL

昨日ネイルを新しくしてきました。
今回のネイルのテーマはヴァレンタインです。
ピンクとホログラムでキラキラにしました。
とても気に入っています。

Yesterday, I did got pink nailpolish done on in a nail salon in Japan. (more natural: "Yesterday, I got my nails done in pink (in Japan).")
The theme was "Valentine's Day" on for my new nails. (OR: "The theme for my new nails was 'Valentine's Day'.")
It The colours are was pink and glittery hologram on my new nails. (OR: "They put glittery pink and holographic nailpolish on my nails.") 
I love my new nails.

___________________________________

Your new nailpolish is really, really pretty. In English, we normally say "new nails" when we mean that we got fake nails. It looks like they just did your nailpolish, but perhaps I am mistaken. 

英語の練習、頑張ってください！