hello cuties! I would like to try sfumato, photo finish, Any advice on what type of thread, fabric, stabilizer, needle works best for this technique, thank you!

Just the same as for any other design really! I've used linen fabric and tear-away stabiliser which I've left in place if the design is to be framed. For the best results, the choice of colours is crucial. You will need graded shades of colour and the darkest shade should not be too dark.