I guess that….
As far as I am concerned,….
In my point of view,….
It seems to me that….
I have the feeling that….
I have no doubt that…
In my eyes,….
As for me/As to me,…
My impression is that…
Mt own feeling on the artwork is that…
I am sure/ I am certain that…
I share your view.
He is quite right/ absolutely right.
I have come to the same conclusion.
We are of one mind/of the same mind on that question.
I am at one with him on that point.
That’s just it!
I think so.
He may be right. I have no objection.
I hold the same opinion.
That is right.
Yes of course!
I don’t agree.
I think otherwise.
I don’t agree with what you say.
I take a different view.
I can see where you’re coming from,but…
That’s an interesting point,but…
I’m not sure how that applies.
I don’t think so.
I don’t think that’s quite right.
I am afraid that is not quite true.
I don’t share his/her/your view.