Trick trout,
Thanks for the compliments about my baits. To make the black marking on the Largemouth pattern I use a stencil. I use thick cardstock paper or a playing card from a deck of cards and cut out the shape with a pen knife. After that just apply stencil to the bait and spray. I really don't have any tricks just take your time cutting the stencil, because I believe your paintjob will only be as good as your stencil. Hope this helps. If you have any more questions feel free to ask.