Hm...can't see your photo. You need to upload your photo to some site (or to Dropbox like you did with your .apk in another posting) and get the URL. In the text editor on this forum, paste the URL in the text box after clicking on the image icon, and click on ok.
Ok here is my paintpot. I was unsuccessful at changing line width - I couldn't find it anywhere so I played with dot size by making it a variable and indexing by one up or down each time the buttons are pressed. I also added a label with instructions. I would love to see the code for line width or more precisely where it is.
I added two extra colours (Yellow and black) and the ability to change the size of the line (Small, MidSize and Big) It's the same tool for dot size. I added an animated gif but it appears not to animate on the emulator.
I copied some of these ideas without even knowing it. These must be obvious needed improvements. However, the tutorial refers to version 1 and the appInventor is now version2 beta . This made me pay attention. I also added a couple extra colours just to fill up the space ... of colours. Mine