"We need to follow the same pattern/steps." It's not a good idea to use modal forms ("we'd better") when describing grammar rules, as the students may already be wondering if the pattern is optional.

I mean if I can call pattern to a way of describing photos that is repeated to help students, for ex.first general view.then clothes.then place...

Both words are correct. It just depends on what you are referring to. If you are referring to a specific procedure, then use steps, otherwise pattern is best.

Sorry, unclear. Please elaborate. Do you mean replacing "follow the same pattern" with "follow the same steps?"