The best thing to do in both these situations is to email straight away attaching any image references that reflect what you're after. All of our illustrators are capable of more than just one style and may have something to exactly match your requirements that just happens to be omitted from their current portfolio at present.
With all of our work, sketches are supplied and agreed before any final artwork is produced, ensuring that the client is 100% satisfied with all the artwork we create. The main focus when selecting an artist should be the finish they produce the artwork in. All the artists can draw any content, it's just the style that separates them from each other.
I hope this clarifies a little more regarding the commissioning of any artwork with us and look forward to hopefully hearing from you in due course.