What are the two tiny stubby things on the wing tips?
Luneberg lens probably, to hide real RCS.
Maybe or could be a RWR sensor
They are likely a type of sensor. They can't be the Israeli ELT-568 jamming pods either because it's too small to be the ELT-568. I have seen a photo of a MiG-29UPG with a ELT-568 mounted on one it's vertical stabilizers. It's most likely an RWR or some other pod based sensor as stated by another poster here.
I don't think it's a luneberg lens, actually I don't the MiG-29UPG or any 4th gen aircraft in the IAF or any AF in the world be it the RuAF, PLAAF, USAF, RAF uses luneberg lens on 4th gen aircraft because irrespective of what you do, it's very easy to determine the RCS of a conventional aircraft such as JF-17, F-16, M-2000, Tejas, Su-30MKI compared to a stealth aircraft such as J-20, J-35, B-2, Su-57, F-35 or F-22. For e.g, both Ukraine and Russia have Su-27 so both the countries know the exact RCS of these jets, another example is Turkey and Greece with their F-16s. I have yet to see a photo of a conventional 4th gen aircraft with radar reflectors.
Stealth aircraft are in another league. Their RCS is something that every country fielding them wishes to conceal their true RCS.
Anyways here is an IAF MiG-29UPG with various sensors.