An Introduction should answer three questions
1. What am I talking about in this paper?
By answering this question you let the reader know what the subject of the paper is. For example, if your paper were about a particular book, your answer to this question would give the title, author, and any other necessary information.
2. How am I going to talk about it?
This is where you let the reader know how your paper is organized. Here you very briefly introduce your main points or the evidence that will prove your point.
3. What am I going to prove in this paper?
This is the dreaded THESIS STATEMENT. The thesis is usually the last sentence in the first paragraph and it clearly states the argument or point you are making in your paper.
As with most photography and illustration, the richness of the cyanotype print can only be shown in the original. When re-produced in print or on screen some of the quality of the original print and its textures are lost, primarily because the RGB  colour range used for screens is shorter than the original prints.
Tips on Writing Thematic Essays
See, first, for different ways of getting your reader involved in your essay. The introductory paragraph should also include the thesis statement, a kind of mini-outline for the paper: it tells the reader what the essay is about. The last sentence of this paragraph must also contain a transitional "hook" which moves the reader to the first paragraph of the body of the paper.