'conscious of him' is correct and can be used in written English.
You can use it to describe someone's awareness or recognition of another person or thing. For example, "The group was conscious of him as he began to speak."
And whatever good they do, they shall never be denied the reward thereof: for, God has full knowledge of those who are conscious of Him.
How hard he tried to make me a spiritualist!" And yet, "Very conscious of him - tonight".
I was conscious of him through the rest of the meal, and held myself as though he were conscious of me.
"We're very conscious of him getting his rest," Landis said.
"You have to be conscious of him," Ducks defenseman Clayton Stoner said, "knowing you're going out facing Duncan Keith rather than one of their bottom four defensemen".
With Porzingis's height and frame, the Knicks have been conscious of keeping him healthy, though they are not fretting his durability.
My first conscious recollection of him: on our television screen in the living room prancing, cavorting and singing "I just want your extra time, and your kiss".
We talked about my childhood, but I was conscious of not overloading him with my memories.
He has a specially adapted chair, takes part in various activities and is conscious of everybody around him most of the time.
I am more conscious of them.
That is my main worry because the focus is your face, isn't it?"" Parents suggested that as their children got older, their peers were more likely to notice the poor appearance of their teeth and "point at it" which may have social consequences including lack of confidence: " "My son ended up conscious of that, it affected him for years and his second teeth, it distressed him.
