Are you open to painting people and pets? A lot of money follows emotion, and kids and pets are where a lot of people like to spend. I’d imagine dogs aren’t too far off from Houndoom, so it may be a transition worth making!
As for logos, the company will make money off of it, so even if it takes you a half hour, don’t short yourself. $75 is super reasonable for a logo, but may still be a low.
Have you looked at Sketchmob? I have commissioned multiple works from that site. I find that giving artwork of people’s pets is generally a hit for gift giving holidays but am not super artistically inclined, so I commission, print, and frame.
Your work is nice! Keep up your hard work!