Short answer: Yes, many Jain households have Tirthankara images (or their symbols) and Yakshas/Yakshinis in a home puja room, but the exact practice varies by tradition.

Key points to keep in mind:

• Digambar tradition: Often emphasizes simplicity. Some households prefer not to have multiple idol images and may use Tirthankara symbols or small, simple idols. The focus is on inner purity and the teachings rather than elaborate worship.
• Shwetambar tradition: More common to place small Tirthankara idols or pictures along with Yaksha/Yakshini images in a dedicated altar for daily puja.
• Placement and etiquette: Keep the area clean and calm. The altar should be respected as a place of reverence; avoid clutter, and place images in a respectful facing direction (often toward the space used for prayer). Use proper items for puja (lamp, incense, offerings) and perform daily rites with sincerity.
• About Yakshas/Yakshinis: They are considered guardian deities of the Tirthankaras. Having their images alongside the Tirthankaras is common in many homes for protection and auspiciousness, though exact traditions and names may vary.

If you want, I can check for a specific guidance page from Jain Knowledge that matches your tradition (Digambar or Shwetambar) and share a precise, tradition-based procedure.