Blake's Book of Job can be found in many websites:
Blake Archive, the Gutenberg.org, wikipedia, bc.org, and many others, no doubt. Adelaide University (Australia) provides a picture and an engraving as well.
Job Plate 5 on
The biblical text that Blake included in the engraving:
 But he said unto her, Thou speakest as one of the foolish women speaketh. What? shall we receive good at the hand of God, and shall we not receive evil? In all this did not Job sin with his lips.
And when they lifted up their eyes afar off, and knew him not, they lifted up their voice, and wept; and they rent every one his mantle, and sprinkled dust upon their heads toward heaven.
James 5:11 Ye have heard of the patience of Job, and have seen the end of the Lord;
In the image:
Job is despondent, as is his 'God' above. Here he depends on the Letter of the Law, giving alms to 'the poor'. But Satan is full of energy.
This like all the Job pics is represented as the contrast between the inner and outer, between the mundane and the eternal. There is little of the eternal in this picture. We get very little from Blakes Book of Job, or anything else for that matter if we confine ourselves to the literal interpretation.
Here's the picture: