Analysing imagery of the Snake bites

http://www.emedicinehealth.com/snakebite/page12_em.htm

The above photo is a western diamondback rattlesnake bite which shows tissue damage, swelling and blood. This wound is quite new as you can see the blood colour is quite fresh and so its probably a photo taken after a few hours. 

http://www.emedicinehealth.com/snakebite/page12_em.htm

The photo on above shows a timber rattlesnake bite which shows 'a leakage of blood cells out of the blood vessels' and it has expanded to other parts of the body (not only the bitten part). Also there are a big area of bruises on the arm as well. 

http://yxzl.baiduyy.com/chm11/jzyxtp/ch.16.htm

On above is a photo of showing the rattlesnake envenomation of a victim after bitten in Day 1. It shows that the finger is swelling and some edema beyond the place it was bitten. There is also a hemorrhagic bleb at six hours after bitten by the rattlesnake. In this stage, it would be considered as mild to medium stage of a snake bite.  

http://yxzl.baiduyy.com/chm11/jzyxtp/ch.16.htm

This is a photo which shows the progression of the rattlesnake envenomation after seven weeks of what the wounds look like from above. You can see there are tissue loss around the wound and eschar formation on the wound area. There is also mild changes in coagulation parameters. By comparing to the photo on above, the heeling process gone much better after 7 weeks. 

http://yxzl.baiduyy.com/chm11/jzyxtp/ch.16.htm

On above, the photo shows a serious Rattlesnake envenomation. The victim has got a rattlesnake bite on his hand and you can see the hand is swelling, the snakebite mark, clearly seen coagulopathy and subcutaneous ecchymosis on the skin. 

http://www.venomoussnakes.net/snakebites.htm

On above shows what the snake bite wounds look like after several days of the injury. You can see subcutaneous ecchymosis, swelling and blister on the skin. Necrosis can also cause depends on how venomous the snake is.

http://www.venomousreptiles.org/libraries/showfilepage/2649?offset=55

On above is a photo of a Prairie Rattlesnake (Crotalus viridis) bite. You can see the finger is swelling and there is internal bleeding. This is probably what a snake bite looks like after bitten in day 1. 

References:

• http://www.venomoussnakes.net/snakebites.htm
• http://yxzl.baiduyy.com/chm11/jzyxtp/ch.16.htm
• http://www.emedicinehealth.com/snakebite/page12_em.htm