A little more detail would be nice. How long have you been drawing pets? portraits? what do you consider your style? obviously you want references, but how many would you like? what do you require in a reference (ie, 'a photo, at least 500px wide) What do you think your strengths are?
Like - I've been drawing portraits for x amount of years in a realistic style. I'm really good with line and colour. When purchasing this, I'd like a clear photo, that clearly shows you, and is 500px wide.