Picture two performers.
One has you select a card and return it to the deck. He place it in the box, which he holds up. He just stares at the box and your card rises up out of it.
The other has you select your card, return it to the deck, and places it in a wineglass instead of the box. The glass is placed on the table. He asks you to clear your mind and think only of your card. He stares into your eyes a moment before pursing his lips slightly in thought and nods. He turns to the glass and holds his open hand out. For a moment nothing happens. But as he begins to gesture slowly as if pulling something up, your card starts to rise out of the deck until it reaches the top of the glass and falls out.
Which one is more interesting?
I would say that there are two types of magical gestures: explicit and implicit. Your's is implicit. There's no flash, no bang - just subtle, natural movement. Your hand pulls at the air, and the card rises towards it. You don't need to add anything to it because it makes sense, and the audience can draw the conclusion as to what happened.
Derren Brown, in I-can't-remember-which-but-one-of-his-books, talks about the audience needing to see the magic happen, of there needing to be an actual process that the audience can identify. The magical gesture lets them know that the magic has happened.
But also consider explicit gestures, of the sensory and visual nature: an electric jolt coming from your finger and pulsing to a friend's finger as you read her mind, a wisp of smoke coming from nowhere as a coin appears at your fingertips, an impressive flash of fire as an image teleports from one scrap of paper to another, or a cold chill in your skin as you feel a magician's pulse begin to slow.
What's weird is that some of these explicit gestures fly in the face of making sure your routine is logical. Coins don't come from smoke, and people don't get zapped when you read their thoughts. But that's only on the surface - ask yourself, how
would a coin appear, if it did visually? Why not in a wisp of smoke? What
would thought transfer feel like? Why not a tingle? In these cases, you can get away with it, because you're already playing by the rules of magic and sorcery.
The point of all this being what Derren was saying, you need to show the magic is happening other then standing by while it happens then pointing it out. But that's not enough - you also need to find a logical way to do that.