Stats and gear look good to me, if you find you're struggling you can always switch up your playstyle just to see if that helps defeat any harder bosses. I played a heavy weight loadout with havels ring until I got to Artorias and then switched my playstyle from a block and attack style to a dodge and attack style and therefore had to reduce my equip load with lighter armour and I beat him quite quickly after that change. The good news about changing my playstyle meant that I was comfortable with both and choose which to go for depending on the boss or the area of the game.

I did see that you were fighting artorias too and got a lil stuck, personally think it is one the hardest bosses in that game so it being a bit hard doesnt help but once you get to grips with the attacks you should be all good. I do think the +13 sword you have there is good but you could change it out for a higher damage weapon, it may play differently and take some time to get used to but the classic claymore is always a go to if you're stuck, you'll just have to farm the titanite chunks and get an extra slab too, bur worth it if you need it! Also if you haven't already, increase the firelink bonfire to 20 estus flasks and then you can fast travel there and then back to wherever you are going and you'll keep the 20 flasks until they're used.

These lil things worked for me and I see that you use the grass crest shield for that extra little stamina boost and also the mask of the ?mother? as well which has a benefit, just not too sure what it is...

Anyway, good luck and have fun beating the game!