Upload & Sell: On
The first has nice shape and texture but looks a bit dull, probably because it doesn't use the full density range. Compare the levels of the first with the fourth image. Easy to correct with a levels adjustment layer and dragging the right setting a little to the left.
The composition of the second may not be the strongest. Consider some cropping variations and perhaps reduce the eye-grabbing bokeh highlight to the right of the clover flower.
The wood checking is a nice pattern and I'd specially suggest keeping it as a good texture image for future composites.
The fourth is nicely rendered, but too random to be a texture and I can't pick out a visual anchor to establish a meaning, although I'd suggest it might seem more stable and grounded if inverted.