spirits too small?

i just got unity and i bad at art so i go in to photoshop and make spirits with very little pixels but when i put them in to unity it is to small can i change the camera or something else i just need a way to fix it

You can change the Sprite.pixelsPerUnit setting of the Sprites smaller in inspector. Or change the Camera Orthographic size (2D) or View Angle (3D)

If possible and especially if you are going to use physics, I recommend changing the Sprite.pixelsPerUnit so your objects will be of reasonable size in world units.