As the candle burns, examine how it burns. The way your candle burns tells something about the task. Candles change things, but also tell you what will and is happening in the way they burn. It can tell how the request is going, being received, will turn out, and how hard it is to achieve.  

Did the glitter or wax stick to the glass? Meditate on the shapes and colors left there. Can you see any forms or symbols in the wax left on the glass? Maybe your request is not so straightforward or maybe it's a sticky situation.

How did your candle burn? Did it keep going out? Did it burn slowly or quickly? Did the flame flicker? Did it burn cleanly or give off soot?

Again, meditate upon what message you get about how it burnt. As a general guideline - think positively first. What a candle does is not a "bad" sign.

That may be hard to do faced with any emotional issue:  If it gives off soot, you are burning off the negativity and obstacles surrounding your issue.

Keep burning a candle about the issue until it burns cleanly. If it flickers, your candle is working hard. Perhaps there is some vacillation in the progress or even in your own mind.

Did it burn slowly or go out? The task may require a slow and careful process. Or there could be numerous obstacles to overcome and the candle is laboring with all its might. It may also be indicating that you need to reassess the way you are thinking about your request.

Maybe things have changed since you started the candle. Maybe you are not thinking of the highest good of all parties involved. Candles can, in those circumstances, go out. If this happens, it is part of your symbolic work to relight it and think about the issues at hand.

Spiritual work takes participation. The candle may need your help to keep working and overcoming obstacles. You might need to dig wax out or dislodge the wick. This might require carving down the outer sides of the candle. Never pour off the center, it creates a bigger hole in which to drown your wick.

Keep lighting it and working with it. Sometimes, a candle keeps going out and it is reflecting a bigger process at hand. There may be an issue of your fate and more at hand than your wish. Perhaps, you do a candle to keep your job and it keeps going out.

The candle could be indicating what is happening. A single candle sometimes cannot overcome massively dire circumstances that may be part of propelling you into evolving.

Keep in mind that your candle may not give you the specific wish, but it will take care of you. Even if you cannot see the good in whatever happens, know it will come.