First impressions: The photo is beautiful, almost more like graphic art than like a photograph. It's funny, when you stare at it it looks flat (as in one plane) and has a lot of depth, both at the same time. Very interesting. Meets the challenge without problems.
You must have turned the brush over before taking the photo. My one nitpick here are the words on the brush, I'm wondering if cropping just a little higher (eliminating the words) might improve the picture. Something to try.
Focus is excellent, all that needs to be in focus is. Lighting is very good. The colours really shine in this picture. The metal on the brush doesn't have any annoying glares. A bit better light on the right side (to minimize/eliminate the shadow of the brush and the slight grey cast to the edge of the paper) might have helped.
Overall this is a very good entry to "Secondary Colours", not much to complain here. You seem to have a liking for graphic design type shots, and you do them quite well.
Nice, clean, simple, interesting. I like the fact that you flipped the brush so green is on orange. Lighting could be a little more thorough - would avoid the shadow on the left side of the brush. Plus the focus on the brush seems just a hair off. All in all, excellent work. 9 md
I love how the painted line has a 3d effect to it. Good lighting. The only thing that confuses me is that the paint on the brush looks red and the paint on the paper looks orange. 8
Topical, perhaps an iota too much so. The stroke, however, is fluid and natural with a near 3-D appearance. The colours are not only secondary but also complimentary in an organic sort of way. The ample white space appropiately suggests a canvas.
The fact that the embossed brush size is slightly out of focus introduces a tiny imperfection, most welcome here. > 6