Talking about art, some dimensions and keywords.

What aspects of art could we use in giving feedback? In education teachers do use these words when assessing art work of students.  Talita Groenendijk et all. did a study and collected these (and other) aspects.

Talking about Originality  and creativity we could use some of these words:
Creativity; divergent thinking; flexible thinking; flexibility; identification of distant associations; to what extent are ideas original, inventive, ingenious, non-standard in concept and form; inventiveness; originality; taking risks; playfulness; implementation; fluency; fluency of ideas; preference for novelty.

We could write a comment like
In your photo I see the elements A, B and C. I see a playful and associative use of these elements in your photo.

 Roy Williams postete vor kurzem auf Twitter, dass es für die erfolgreiche Etablierung einer Online-Gruppe “comfort, fun, trust, engagement” braucht. In online feedback comfort, fun, trust, engagement  are very important for online learning. Make your comments fun and comfortable.

Talking about the Picture:
Composition; contour fusion; detail; aesthetic organization; use of composition; how effective is the use of distance, nearby shapes and overlap?; The unity of the  composition, the manner in which the main part is placed ?;  color, shape and composition; lines; use of space ; organization (overall composition); flat or spatial representation; realistic placement of elements; representation; atmosphere;  use of details ; relations that correspond with reality; differentiation in shapes.

We could write: I see a  composition of the elements X, Y, and B and C that has a unity in color and a variety in shapes.

Concept / idea 
combining concepts and rearrange parts; complexity of visual or conceptual ideas; clear intention; How suitable are the elements for the expressed ideas? do the elements express the intended meaning?; communication of personal ideas, intentions, experiences, information and opinions in visual and other forms; application of abstract relationships to generate a new concept; imagination; vision; visibility of intent.

I see a rich variety of colors. But I did not link your title and the content of the photo.

Remaining concepts
awareness of  missing parts; elegant solution; impact of the product; inspiration; knowledge and understanding; multiple intelligence skills; productivity; clean and tidy; sensitivity; strategies and skills; synthesis; ability to transform things; ability to abstract and to go to parts of the whole; preference for cognitive complexity

source: http://www.lkca.nl/kennisdossiers/beoordelen/reviewstudie-assessment-in-kunsteducatie (Talita Groenendijk & Folkert Haanstra)  (my translation)