Photoshop Face Into Graduation Photos

I missed my own ceremony and would like at least two believable graduation shots where my face is seamlessly placed into casual group photos I’ll supply. The gown, background, and overall scene must remain untouched; only my face is to be integrated... (Budget: $10 - $30 USD, Jobs: Adobe Photoshop, After Effects, Digital Art, Graphic Design, Image Processing, Photo Compositing, Photo Editing, Photoshop, Video Editing, Visual Effects)