Can someone help this be scaryer ???!!!?

I'm writing a story and right now the setting is a forest. Snow had only started falling a night or so ago but already the chilly wind was nipping at my expossed neck. Just like a flash of lightening or the strike of a cobra father was their a moment and gone the next. Something brushes past my leg, scream, jump, run away- my instics. Paralyzed with fear. Steam rising from a black lump on the white ground not 20 feet away. My breathing heavy fills the silence, then all goes quite for a moment steam stopped rising. A head shoots up from the black lump. My feet can't carry me fast enough, I turn for a second look, WHAM, thump, blackness...... Is there anyway I can make it better please comment :)