Originally posted by Nomad I do think that you had a good eye for what you wanted to see and if not for some technical problems it could have been a great shot.
1. I use center point focus then recompose while holding shutter 1/2 depressed to lock focus.
2. As stated above, center weight meter off of fair skinned subjects so as not lose highlights.
3. Try not to cut off hands, arms, or heads unless done for artistic expression but that is a whole dif discussion.
4. Keep shooting and have fun!!! Cute kid, won't be your last chance for a great candid portrait.
I agree with all of this. I'd add:
Consider turning on the "blinkies" which will show you when you are clipping highlights (and conversely losing shadow detail) and also turn on your histogram so that you will start to recognize what highlight clipping looks like. Apply appropriate compensation and bring the exposure up in post processing.
This can be hard since you are running around a park, but generally on a sunny day, the compensation, once set is fine.
On a sunny day use the opportunity to run a higher shutter speed. This will help both with camera shake and subject movement, overall tending to yield more in focus shots.
If you can wait for the SR "hand" to show up a little after focus lock, do so. If not, again, shutter speed will help.
Keep working at it. Your subject is adorable and you'll get much better at this.
woof!