I think you should improve your drawing skills, just to make your joke delivery a bit more coherent. Here's an example of a comic done in paint:
This guy posted a tutorial on his work, but I couldn't find it so I'll run through a few tips.
Establish a process for your comic making and stick to it. By planning, you'll be much more efficient (and always write text in speech bubbles last, so you don't have the problem you had with your second comic)
Use broader lines; the paintbrush tool is great for this (Ant himself gets his line effect by drawing a thick line, then thinning it down with the eraser, this gives you more control over the line, so you can make them more accurate and dynamic).
Don't be tempted to use the oval and square tools to draw with; they just end up making your comic look flat and amateurish.
Use custom colours, not the pre-set ones on the palette; again, bright colours will make you look like an amateur, more neutral colours (colours that are closer to grey) are easier on the eye.
If you use shadows avoid gradients
Make your comic smaller; there is a lot of unused space in your comic and it just makes it look empty (in your initial comic, the sun could have been closer, drawing a bit more scenery would help).
Use panels and borders, they make a comic less confusing and easier to follow.
Practice producing facial expressions; this will make or break your humour.
And lastly; make sure you pin down a specific style and stick with it, a lot of comic artists remove features they consider arbitrary (for example keydar does not draw noses) it's best to get rid of unnecessary detail when drawing because it saves you time and your comic will be more coherent.
I reckon there'd be a major improvement in your work if you followed these guidelines.