Looks not too bad for your first try, it will only get better with time.
As for the crank makeing more power gains then the sleeve, I tend to disagree. Although opening the crank does increase power, it is just a part of what needs to be done to an engine to make it perform at it's best.
Some cranks come already timed out from factory with reliability in mind, other cranks can be opened a little sooner or close a little later, these numbers are determined on a per engine basis. There are other things that can be done to the crank to improve it's power gains that are just about as effecive as the timing change as well, it does depend on which engine you have though.
The sleeve ports are what separate the crank case from the combustion chamber, this is where the most power gains can be made by altering timing and directing ports. Opening the port timing allows for more air/fuel mixture to enter the chamber for a longer duration, the crank timing does help with the fuel delivery to the ports but they ultimatley meter the amount of fuel that reaches the chamber. This part of the mod is by far the hardest as the most amount of damage can happen in the least amount of time, even cutting the chrome in the wrong direction can lead to premature wear and permanent damage.
Doing flow mods is pretty easy for alot of people, if done right they can add a very small overall gain mainly in fuel consumption but not so much on the power side. It takes hunreds of hours to perfect the modification techniques to make substatial power gains and a real performer out of an engine. This can also cost thousands of dollars to gain an understanding on what will work and what will kill an engine, timing wise it doesn't take much to lose performance and gain an engine that is very picky on the tune.
I have said it before, "If you can't afford to walk to the garbage can and drop your engine in it and walk away" don't mess with it.
jmho, Thanks.
Robin.
