I sometimes browse the
Gallery - all the shots there are good, but some stand out. I then try and evaluate what it is I like about them (I've found you can take copies of then so you can have a collection of your favourites).
It's all personal, but I think lighting can be very important. Shadows really bring an object to life - a lot of the shots I like were done in the morning or evening.
And just experiment. And have fun

