Yes the pic quality is low. Size limitations and all. There is always a visible
line between layers of filler materials no matter what the material. The reason it is so easily seen is that the pic was taken after coating it with a layer of
epoxy resin to help seal it. This made the color differences stand out. You can see that there is a reflection on part of the keel toward the rear. Add a camera flash, and they really stand out. Some of the straighter
lines were due to using an old spreader that left
lines in the filler, and were filled with the next layer.
I never was very good at spreading filler so that it gets done in 1 or 2 shots. My keel has about 1/4 inch difference between the stub and the lead. It only took me about 5 tries to get it right.