Finshing to lines

Now I have traced all the lines I'll sort the colours out and effects.

first I just made the lines red to match image I traced.


I then changed the stroke to a gradient.

Some of the liens are over other liens where I want them to be behind, to fix this I seelct the line/shape and then left click it, go to arange then send to back, which sends the shape to the very back of everything on the layer, or send backwards which sends it behind the shape directly behind it on the layer.