It looks too dark to me; if there were a way to have the lights overhead and aimed down at the plants it would be the most beneficial (ie hanging fluorescent, HID or LED lighting). You might also be able to increase light levels with reflective mylar sheeting, but that would probably require a frame of some sort. Airflow is great, but you should consider a way to capture (and localize) the humidity; most spot humidifiers are simply not capable of increasing and maintaining relative humidity in a non-enclosed area, imho.
Good luck, let us know if you need further details or help,
Adam
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