situation where it doesnt matter whether definite or indefinite article is used?

[slim1111]

Let's say someone is looking at a drawing of mine and criticising
its styles and properties. And then he goes on to criticize something that is
irrelevant the art itself, eg) its frame is bad or something like that
So I want to say not to digress.

"stick to the art please" as in focus on the picture
or
"stick to art please" as in don't talk about something that is not art

Would both sentences convey the same message? is one more preferable to
other because of way it sounds? Like for example in korean it would probably
make more sense to use the second sentence although the first one certainly
isn't bad in anyway but less direct, or at least thats what my intuition tells me.

[Tdol]

It's a similar message, but the second would allow me to discuss other artists, etc. It depends on whether you want to talk exclusively about that picture or not to me.