Be patient! Too many people want it all right now so they become frustrated if they haven’t built their dream body within a few months of training. When such a point is reached, many bodybuilders either quit altogether, or turn to dangerous drugs such as steroids, or synthetic hormones in order to speed up the process. Steroids are insidious. They may produce rapid gains in the short term, however, the compromises are extraordinary and should be very carefully considered. The steroid users that I knew 15 years ago that I wished I could look like are now either dead or out of shape dealing with severe health problems. If you love bodybuilding like I do, then you will want to be able to do it, and enjoy it from now until well into your golden years of life. Don’t get discouraged when progress doesn’t seem to be coming quickly enough. I’ve been there before, so I know how it feels. I can tell you from experience that if you are persistent it will pay off eventually. It took me 26 years to put on 40 lbs of muscle! That averages out to roughly 1.5 pounds of muscle gained each year!
Identify specific muscles you hope to build. As you're posing, it's a good opportunity to check out your symmetry, your good gains, and identify places that you need to isolate or work out more vigorously for next week's training sessions. What needs to be smoothed out? What needs to be bulked up? What exercises will you need to do to get the results you want?
After session 12, consider whether you need to increase the weight for any particular exercise. If you can comfortably do more than the RM of 12 exercises, increase the weight by a modest amount, say two pounds or a kilogram for isolation exercise muscles such as triceps and biceps, and 5 pounds or 2.5.kilograms for compound and large muscle group exercises like squats and deadlifts. When using dumbbells, this would apply to each one. Don’t increase the number of sets beyond 3 at this time.