I recently started using a very basic rubric that goes something like this: the project is one for the 8th graders i do around georgia o'keefe, the students have to use a view finder to draw an abstracted flower (blown up) then outline with glue and finally color with oil pastels (got the lesson here a while ago) then blend out with baby oil....ANYWAY...here are the questions i ask of the work when it is done: 1. is the drawing visually interesting (gives me a little leverage as the teacher), 2. is the object abstracted?, 3. is the glue applied neatly?, 4. are the spaces filled in with at least 3 analogous colors?, 5. are the pastels applied heavily?, 6. are the pastels blended neatly/completely?, 7. is the work complete/finished?, 8. name on it?
Each question comes with 3 points attached to it: 3=yes, 2= partially, 1=no. 8 questions multiplied by 3 is 24 which i then multiply again by 2 for 48. that is the scale on the easy grader that i use for assigning grades. it's really simple, i keep it on paper so the student can see where they lost points or show a parent if necessary. it has saved me on a couple of occasions with the parental units!!! hope this helps.