First you must ensure you've built up your entire ab muscle complex, then it's up to lowering your overall body fat % through proper diet and calorie expenditure (cardio). Only then will those sought after lines show up. :
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You just need to work on adding more lean muscle mass. The more lean muscle mass you add, the less your bones will show and the more muscle will show instead. This will take time, so be patient but very consistent. :
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As I've heard, squats are really good for this. If you think about it, when you go into the form of a squat, take a second and look at the position of your hips. That whole "v" muscle thing is being worked, as well as your lower abs. Your lower abs and obliques are a huge part in that whole "V" look.
My favorite moves for these muscles (the ladies favorite) are leg raises (both lieing on a bench and vertical) sideways situps on a decline bench, most twisty machines are pretty good also. As alway do all with wieght and go hard.
" Rectus Abdominis and Obliques only contract dynamically if actual waist flexion occurs. With no waist flexion, Rectus Abdominis and External Oblique will only act to stabilize the pelvis and waist during hip flexion. It may be necessary to completely flex the hips before waist flexion is possible. "