Maybe it's obvious to say, maybe it isn't. Critique (constructive), so that's positive and negative... is crucial to allowing the artists here on da to develop their work and strive to better themselves all the while improving their technique and understanding of what makes a good photograph/graphic/painting etc.
Maybe you don't think my work is worth commenting on, but I think if you have the inclination to view the piece in the first instance, then maybe you could 'scrawl' a few ideas about it, what drew you to it? what's good/bad? ideas for improvement?
If you think about the piece for even a few seconds only, you're thinking what it say