OK, for your body type and the goals you are asking, the best way to go is circut training.
Since you dont want to bulk up, circut training will keep your heart rate up and train your whole body in one fair swoop. It will hit all your muscles, you will sweat, it will be over in 20-30 minutes. 3 times a week and you should be fine. It is fast paced so you wont get bored. But you do have to do the work before hand. Like, what rountine do you do? Do you have access to a gym? So you will have to look up circut training.
Looking at your body, it is very plain. I would look to put on some muscle. To get the "bubbles" as I call it. But this does require a huge commitment, lots of discomfort, and a dedication that goes beyond the gym. You have to learn about working out, nutrition, the way the body works. You have to plan out work outs, keep a log, modify it. You have to know about caloric intake, suppliments and viatmins.
Who wants to do all that? Well, the people who do look a certain way. And, when you do all that, the workouts are less boring because you know WHY you are doing them. Or else it just seems like you are doing repetions forever for no reason.