Select part of the glass which is supposed to be filled in with drink and create a new layer.
- Fill it with red/transparent gradient again.
- Adjust Linear Burn Blending Mode for the Layer with gradient.
- Create Oval selection in the new layer.
- Fill it with light pink color.
- Adjust Screen Blending Mode.
- Opacity 85%.
- Add Vector Mask.
- Erase some parts of ice in Vector Mask.
- Create a new Layer.
- Adjust Overlay Blending Mode.
- Click on Quick Mask.
- Draw two spots of sunlight.
- Click on Quick Mask again.
- Select > Inverse.
- Select > Refine edge.
Transform sunlight spots.
- Edit > Transform > Warp Transform