The three highlighters! This is a cute photograph. I like the intensity of the third colour, the pink (not my favourite colour though), the other two colours seem to dull in comparison! that's so weird. Nice lighting :)
Very arty, sort of poster I would expect someone to hang on their wall at college style. Nice bright colours against nice dark background. Not my personal thing, but I can see other people wanting something like this.
Good title. Nice composition and colors against the black background . I like the staggered lengths. It might be my monitor but the detail on the red marker tip doesn't seem as clear as the green and blue.
Nice idea, the different levels of the pens looks great too. Background is good... I can certainly imagine this hanging in an office. Good luck with it.