First, imagine how you want your painting to look and where it will hang.
Not all paintings require framing. For example, a stretched canvas can be hung on the wall without a frame. This is a popular beautiful modern technique.
If you decide that the picture still requires framing, then decide on the size and thickness of the baguette.
Also, one of the important issues is color. It is easiest to use universal colors of baguette, they include: white, black, gold, silver, light wood, dark wood.
It is most effective to go to a baguette shop and apply different samples of baguette to your picture. This way you will understand which one is the best.
In case you are in doubt, take advice from the artist or a consultant at the baguette shop.
