How do you assess student artwork?

I feel like student assessment is something that is constantly evolving. Depending on the context and project variables, assessment is continuously. This process can be broken down into formative and summative assessment that can vary between asking questions after a demonstration, to grading students based upon a rubric on their final work. I think it is crucial to have this be an endless process, including both types of assessment. Effort, Completion, Use of class time, Objectives and Attitude are all points of interest that I assess my students on. In middle and high school, I like to hang up a final rubric in the classroom, so the students can reference it and assure they meet all of the objectives of the project. Another type of assessment that I believe is important at the middle to high school level is self-assessment. I typically have my students fill out a self-assessment rubric to see how they feel they did on the project. Completion of this rubric is also factored into their grade. At the elementary level assessment is treated differently. I do not have my elementary students fill out self-assessment rubrics. Verbal assessment works best with younger students to see what they learned and retained. Effort, Attitude, use of class time, and cleanup are attributes I seek when assessing my students at the elementary level.