Here are some haiku from my book, “A Mosaic of Color and Light”.

she touches his hand

over coffee and tears

saying goodbye

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an old house

holding memories and dust

a mouse stirs

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lightning forks blue white

in a treacherous storm sky

thunder rolls aloft

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a thousand stars

light the mountain path

after the sun

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insects buzz

a cacophony of sound

night symphony

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Generally speaking, haiku have been about nature. In Japan, where haiku was invented, it was strictly about nature. With the coming of haiku to the West, some rules were changed, sometimes out of necessity, and sometimes, because people just wanted more freedom. Two of the above haiku are about subjects other than nature, but these are about emotional subjects. Poetry has always stirred the emotions, from its very beginnings, so haiku being emotional is perfectly normal. When you write haiku, think carefully about what you want to say, and say it in as few words as possible. This means thinking hard about the words you use. Make them count. Make them expressive, getting to the heart of the matter as succinctly as possible without excessive language.