The current profile picture you have now is the largest you can have in your current situation. Resizing externally will not make a difference.
however purchase a larger profile picture 2 ways, both require USD purchases though I'm afraid.
Your two options are to either purchase ToriPrime->Forum VIP subscription and accessing it that way. This requires two purchases as ToriPrime is required first before you can get Forum VIP. You can choose to just purchase a ToriPrime subscription for a 110x110px avatar if you so wish (All Perks or ToriPrime and Forum VIP can be found here: http://forum.toribash.com/showthread.php?t=465052
Originally Posted by Bart
Toriprime & VIP is a service available for purchase here.
Toriprime costs $10 for 1 year, and VIP costs $7 for 6 months, however you can only buy VIP when you have Toriprime.
Or alternatively you can visit the Official Nabi Profile customization store
, where there is a subsection for 'Custom Avatars' where you can purchase a 150x150px avatar for $4 USD or a 150x200px avatar for $8 USD, this is permanent however it is worth noting that you do not recieve the other Forum VIP bonuses.