Hi there!
I would suggest to use images with the same style.
Right now you have like 5 different drawing styles flying around the patcher and its quite irritating.
You kept the background/footer and inner part quite simple/plain colorwise (white/blue/dark blue/without effects) and then added a super flashy play button with light and shadow effects, I don't think that's pleasing to the eye.
But keep it up and play around more! I'm sure you will only get better and better. :relaxed:
In case you need some inspiration - one of the patchers I've started recently:
I suggest not to try and occupy blank spaces with chibis/characters. It looks messy IMO. Try to keep the design simple and pleasing to the eyes. Also, buttons give the patcher/website a lot of glamour but yeah, keep it up. Practice makes perfect. Looking forward to your future designs
I'm not implying that I'm better tho. Just giving you some suggestions