Because Windows Phone has NEVER had a recycle bin, that's why.
Wait, just figured it out. You keep saying RECYCLE BIN but mean the TRASH CAN icon. In which case no, you have deleted those pictures for good.
Of course I've seen this type of phone, I'm on a Windows Phone forum. Just make sure you have you info correctly worded to make answering questions easier.
I would have been able to tell you the answer straight away had you said you'd deleted the photos off your phone, rather than saying you'd sent them to the recycle bin.