The sentence you wrote, 'Follow easy steps for a beautiful result', is mostly correct and clear! It gives an instruction to do something simple, which is good for a 7-year-old's writing.
If you want it to sound even better, you can write:
- Follow easy steps for a beautiful result. (This is already good!)
- You can also say, Follow the easy steps for a beautiful result. Adding 'the' makes it sound like you are talking about specific steps that are easy.
So, in short, your sentence is great but adding 'the' before 'easy steps' is a little more correct when you mean particular steps.