Essentially the only thing you need to change is diet, if all you're loking to do is lose fat so you can have more definition. You need a calorie deficit of between 500-1000 calories a day, nix high GI carbs except for right after your workout, and add some cardio if you don't do some already. You can make it very simple or very meticulous, depending on what you will "stick to."
Keep your body lean, your blood clean and your mind sharp. -Rollins