conspicuous, obvious, attention-getting, eye-worthy, eyeful, impressive, eyeworthy, lookable, visitable, irresistible, more...

unremarkable, inconspicuous, unnoticeable, plain, dull

bold, italic, underlined, inverted, superscript, subscript, small caps, all caps, color, red, more...

attention catching,   catching attention,   attracts attention,   visually striking,   visually engaging,   hard not to look at,   attention grabing,   to be striking,   making people stare,   catching eye