The shapes of the weapons and other items aren't bad themselves, but they are subject to jaggy-ness and some are difficult to read.
To fix the "jaggies", you may want to employ some
anti-aliasing.
To make the icons easier to read, especially in places like the folds and leaves of the rose and the.....pile of rocks?, I'd suggest so more contrast in the colors, which you could either achieve with darker and brighter hues, or with some
hue-shifting.
These have hope though. With enough work put into them, these will be ace.