Sure, or drop shadow or outline. Few tricks of the trade, tone and value could work by intensity. Just make sure to take a step back from the computer and see if you can still tell what it is from a different angle (doesnt have to be perfect but tell what it is)
I can for sure make the colours for the bubbles & the text divide better by way of Value.
Sure, or drop shadow or outline. Few tricks of the trade, tone and value could work by intensity. Just make sure to take a step back from the computer and see if you can still tell what it is from a different angle (doesnt have to be perfect but tell what it is)