Hey Agufish,
I would work on your thumbnails for sure. Specifically, I would work on font choice and text placement. Also, maybe take the same banner photo of the LP, SG, etc. but more centered/with better lighting if possible. Add a little text maybe.
As a fellow musician and sufferer of gear acquisition syndrome really like what you're doing with your channel. I hope I wasn't discouraging in any way - just offering constructive criticism.
Hit me up on Twitter/YouTube! I'm @ itsVanAken.[DOUBLEPOST=1433517558,1433517506][/DOUBLEPOST]P.s. The white SG is money. I play an Am. Deluxe Tele. Would love to get my hands on a brown/natural SG though.