Yes. Good advice from a master of color. Colors are a very good way to establish depth.
Another element at the artist's disposal is the amount of detail used. Consider how the eye sees naturally and then exaggerate that. The mind registers more detail as being closer (usually), while getting simpler as it recedes is part of that. If one is subtle about it, the viewer would not necessarily even be aware of that trick, but they would feel that it is right.
I think this seascape is very good. You've learned so much with this one as well and there's a lot of good things happening.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream