Help with new item png image files

[Fatt_Shade]

I got idea to change some items (add upgradable lvls) but got stuck at how to make new PNG files, and how to connect those new item images to upgraded item.
I changed battle axe to add +10(2nd lvl item)/20(3 lvl item like original)/25(5th lvl item)% physical dmg to melee units and +3 att to all units on 5th lvl (3rd upgrade). Changing item.txt weren`t big problem and adding new lvl`s and battles to upgrade item. But implementing that new item in game got me to problems.
If some1 can make 2 new battle axe png files i would be grateful (3rd lvl little brighter axe, 5th lvl some glow on edge or something like that) and attach them them here. As for where to place them maybe i figure it out by then.

Also goblin shaman is only unit that can reduce enemy resistances, i thought about changing some other item to add that bonus to it like -1/2/4% to all resistances to enemy units or something like that which would be equal to +1/2/4% to my unit/spell dmg, but i`m not sure what item to edit to make it interesting to use through all game. Maybe some armor since i think armors are weakest items in game, any ideas ppl ?Attachment 7189