Janet Fish, drawing. When drawing glass objects: Focus on what the glass is reflecting—not the glass itself. Focus on your light sources. All transparent objects are comprised of dark & light patterns in varying degrees of value. You don’t always have to draw the exact reflection—sometimes you can just indicate the reflection as a diffused image (just patterns - not pictures). Highlights, midtones, darks---work darks first, then highlights & then fill in mid tones.