Describe the object in action. In the art world, they speak of "provenance" to describe the condition of a work and who or what has owned/displayed the work since its creation; perhaps include the history of the object as part of your response.
Avoid the use of the second person as it is conversational and too direct. Use first person to describe your own thoughts, but better to use the third person in most of your analysis.
Do not focus on the writing process-your reader does not need to know why you chose the topic or what you'r going to write about. Instead of telling your reader what you are going to do, do it.
Write in the present tense unless specifically describing past events.