Supplementary essays?

For supplementary essays for schools, what is the expectation?

For my main common app essay, it will focus on an EC and work in lots of imagery and have lots of focus on style and vocabulary, in order to show my writing ability. For the supplementary essays, should they be similar in this regard or should I make them to the point? For example, if it says “Write 150-400 words about an EC” then I would just further explain what I did in that EC, but would I make it as factual and concise as possible, or would I talk more about my emotions and how it affected me?

I would recommend to write the supplement about another EC if you can, just so it’s not redundant when compared to your essay. But if you feel that you must right about only one specific EC I would definitely make it more emotional/ how it affected you.

I have plenty of ECs, I can definitely write about an EC which didn’t even appear on my common app. I’m not sure about what my main essay will be about, but in general what do colleges look for in supplementary essays, are they looking at writing ability or more directly about the content?