Need advice..

The back-end would have around 25-50 tables, and some of them needs to hold scanned images (JPEG, TIFF, BMP etc).

I am in a situation, where I need more inputs to decide which database to choose from the following:

FireBird / SQLLite / H2 / any other, please suggest

One could guess from the above is, these database are free/low-cost setup.

TIA