It is a display of the exploration results of the beauty of images in the poet's poems. Another example is the discovery of new materials in engineering, the properties and uses of this material, and so on.
The process of writing a thesis is first to choose a topic, that is, what do you want to study, why do you want to study it, whether predecessors have studied this field, what are the advantages and disadvantages of predecessors' achievements, and what shortcomings do you want to fill. Secondly, we should collect and search data, or conduct scientific experiments and record data. Finally draw a conclusion.
Thesis is a display of your innovative achievements. You have written argumentative papers for so many years, so I won't say much. Thesis and argumentative essay are two different things, which are not related to each other.