Thank you for submitting your item for appraisal. This appears to be a 1960s or 1970s pencil and watercolour and bodycolour painting of a nude reclining woman in a kind of pool setting. The pencil signature clearly reads "Trudy". Possibly a talented art student or professional artist who hardly exhibited.
Unfortunately there is no artist with that name and working in this style listed.
The estimate is based on similar paintings by lesser known artists sold at auction.