Pins on the chip definitely didn't wet properly (solder should flow over the top of the pins as well). Bit harder to tell for me after that due to flux, but I suspect you ran into a combination of oxidation on the chip legs as
SL4P mentioned, and not enough heat for the solder to truly flow properly (ground plane sucking heat off on you).
Might want to "soak" some heat into the board before trying to solder (set the hot air station to say 125C & hit the board before placing the chip). Then add your paste really quickly, place the chip, and solder. An iron may also be of use here (drag method would likely yield better results over pin-by-pin as it's quicker).
There are tools that help with this, such as a
hot air plate or a hot plate/skillet can do wonders (can add temp control to one you find in a local store for say ~$30 max; garage sale or thrift store find would be ideal).
As per cleaning oxidation off of pins and pads, a fiberglass scratch brush is really good for that, and they happen to be inexpensive as well (even a
German made one is ~$11 shipped). Just scrub at the pins on both sides for a few seconds, then wipe with some alcohol to clean off whatever is scratched off as well as any dirt & oils that may also be on there (i.e. from your fingers). Rather quick and easy actually.