This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

What has many teeth, but cannot bite?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What do you see in the image below

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?