Dear Rose,
When I look at a beautiful rose like you, I love your rosy scent and the way how you look. When I see you, it reminds me of someone who I love and care about in my heart. A rose like you, brings me happiness and smiles to my face.
If they're unlike things - it would be a metaphor.
When it comes to similes - you use words such as like or as when describing things. and since it emphasizes "unlike" things - metaphor would be the way to go.
It's quite hard sometimes when it comes for deciphering the two if you're familiar with the rule - so just remember: Simile: like or as.
Metaphor: extreme exaggeration, or a comparison without using like or as.
I hope all is well, and you pass! (: Good luck, rockstar! (: