Bad conducting technique signs

Elbow pointing down. Where is your sound– down or around you? Surround yourself with sound or don’t conduct at all.
Widely spread fingers or conducting with index finger for more than beat or two. (Do you threaten or single people out?)
Bending knees with the beat (very common). It is distracting, and unnatural.
Bending head with the beat (very common). Looks very uncomfortable, is your neck hurting?
Tucked neck, or forward neck: You must have stiff shoulders then.
Stiff or razed shoulders. Yes, see the above.
Hands that mirror most of the time. This is boring and screams “poor technique” Fix it!
Hands that move in only one physical dimension Infront your body. Have you heard of dynamics and phrasing?
Body continuously leaning on one side: If your body can’t keep balance how your music would?
Missing beat preparation or just catching up the beat (this is really bad one, how people can really play/sing with you). Do you chase the performers, or you want them to chase you for the beat?
Forgetting that score had many more layers than the melody. Yes, these conductors that hear only the melody.
Conducting behind the beat; you wait the performers to lead you, then just go, they can play without you!
Not knowing well your score!! Who is coming, when, who is important, why? Where is the climax, and then, what? Relationship between sections, movements, tone color? I would say, learn to play piano first, and then venture to conducting. Take responsibility of your sound.

How to fix all these? You need solid lessons, find a teacher or call me.