This is your most polished looking page to date. It is something to be proud of. I wasn't sure what you meant by color lines. But then I looked up and saw it mostly on the faces. So I'm sorry if I missed other examples.
I think it works. Personally. I'm also used to the black outline, so either will work for me.
The colours are good, shapes are defined and the layout is cleanly done. The first panel with the leaves is interesting done. But they don't share the same treatment of anything else out of focus on the page.
In fact, I think that is my only 'complaint'.
Well ... There is the missing path to the bench in the back, but all in all, very well done.