Sometimes we make custom stamps (we are a little busy now). Please, send us a picture of it and one dimension (height for example). We'will check if it is feasible. The best is the contrast sketch or something existing from the internet.
Something like this: www.shutterstock.com/cs/image-vector/cat-vector-illustration-290469629 is much better than this: https://thecreativecat.net/daily-sketch-walking-toward-me