1st- Hello and welcome to [words=http://www.mattersofsize.com/join-now.html]Matters Of Size[/words] (MOS), consider this a place where you can get help for any problem of yours whether it be a PE (Penile Enlargement) one or not. All users around are brothers and give support and help to each other!
2- 1.5 cm of length and 0.5 of girth gain is a great gain my friend! We have a lot of people around the forum that struggle with gains and are unable to gain that much in twice the time you PE-ed for. One thing you should remember about PE is that gains do not come overnight and there might be periods of time where you will not see improvements for as long as 1-2 months, but that must NOT down your consistency and dedication towards PE. You already know and have seen yourself that it works and it gives you good gains. So I would just advise you to change your mindset a little so you do not lose hope and courage if one day you see you made no progress in a period of a month or two.
3- It would seem that you got discoloration. It is not something you should stress about, no worries. It seems you did the jelqs with a pretty tight grip and more than 80% EQ (Erection Quality). Discoloration is something that occurs pretty often for all of us, but as long as you do not overdo the intensity of your PE session and perform a deep massage as a warmdown after your session- there would be no PERMANENT discoloration, so calm down. Sometimes you might see your discoloration lasting for months, but once you stop doing PE (when you reach your final goal and want to add no more)- it should get better after a few months. To prevent PERMANENT discoloration (one that does not go away) you can also apply discoloration creams and other supplements. Here in [words=http://www.mattersofsize.com/join-now.html]MOS[/words]- there is a lot of information just waiting for you to read it. The best advice that I can give you is to just stick around and try to get as much as you can.
Cheers my brother and if you have any problem or question- ask me, I will be around and try to help you with whatever I can. All the best, Zam