Take a look at the most common selling products you're having issues with, to see what your frequent movers are. Order the parts, take your pictures, and then ship the parts to your next buyer, only incurring a small loss on the whole thing. The other option is approaching your dropship supplier, asking for 15 or 30 day terms on the items, so you're not out of cash up front.
But it's not really a loss on the shipping to and from part, and here's why. Everyone else that's selling those products are probably having the same issue of terrible photos. I ran into the same problem on Ebay a few years back with some auto parts, so i took much better pictures and sales increased dramatically & immediately. We took so much market share from others, that they started emulating our photo methods and blatantly stealing our pictures. I can go on ebay right now, 3 years later, and still find pictures that i originally took.
Its important that any picture you have and use should be watermarked with your company, others will try and steal your photos if the products you're talking about move any kind of volume. Detailed pictures increases conversion, plain and simple. Dont just copy the stock product photo with a bit higher resolution, get multiple angles, and even close ups of details if applicable.